At 19.9 degrees Celsius, we dissolve a salt crystal.

The Red dot on the graph in the image above represents the time it took to dissolve this salt crystal and the temperature at which it dissolved.
What temperature is represented by the red dot?
Enter the number of degrees Celsius only; no units.

Answer:

There are 1.29 moles of toluene in the solution.

Explanation:

m = ∆Tb/Kb

m is molality of the solution

∆Tb is the change in boiling point of cyclohexane = 90.3 ° C - 80.9 °C = 9.4 °C

Kb is the boiling point elevation constant of cyclohexane = 2.92 °C/m

m = 9.4/2.92 = 3.22 mol/kg

Number of moles of toluene = molality × mass of cyclohexane in kilogram = 3.22 × 401/1000 = 1.29 moles

Final answer:

NaCN is likely to increase the solubility of ZnSe in water due to complexation with Zn2+, which drives the dissolution equilibrium forward.

Explanation:

The question asks which compound is most likely to increase the solubility of ZnSe when added to water. Considering the principles of solubility and the common ion effect, the best compound to increase ZnSe solubility would not be one that provides a common ion, as that would decrease solubility. Among the options provided, NaCN seems to be the most suitable choice.

Cyanide ions from NaCN can form a complex with Zn2+, effectively removing Zn2+ from the solution and driving the dissolution equilibrium of ZnSe forward. This complexation increases the solubility of ZnSe due to Le Chatelier's principle, where the reaction shifts to alleviate the stress of the added CN- ions by dissolving more ZnSe.

Answer: 137 kJ

Explanation:

Latent heat of vaporization is the amount of heat required to convert 1 mole of liquid to gas at atmospheric pressure.

To calculate the moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{100g}{17g/mol}=5.9moles[/tex]

1 mole of ammonia requires heat = 23.3 kJ

Thus 5.9 moles of ammonia require heat =[tex]\frac{23.3}{1}\times 5.9=137kJ [/tex]

Thus the energy is required to evaporate 100 g of ammonia at this temperature is 137 kJ

Final answer:

To evaporate 100 g of ammonia at -33.3 °C, 136.76 kJ of energy is required.

Explanation:

To calculate the amount of energy required to evaporate 100 g of ammonia at -33.3 °C, we need to use the molar enthalpy of vaporization (∆Hvap). The ∆Hvap for ammonia is 23.3 kJ/mol. First, we need to convert the mass of ammonia to moles using its molar mass. The molar mass of ammonia is 17.03 g/mol. So, 100 g of ammonia is equal to 100/17.03 = 5.87 mol. Now, we can calculate the energy required:

Energy required = ∆Hvap × number of moles = 23.3 kJ/mol × 5.87 mol = 136.76 kJ

Answer:

The answer to the question is;

The inter-molecular forces of water are stronger than those of hydrogen.

Explanation:

Ammonia is a compressible gas at room temperature with molecules free to move about and so fill up the volume of the container in which it is placed due to the weaker inter-molecular Van der Waals forces such as Keesom, Debye and London dispersion forces holding the particles of ammonia together in a given volume of the compound.

The inter-molecular forces between water molecules is hydrogen binding and dipole moments due to the strongly electronegative oxygen and hydrogen which tends to move the electrons towards the oxygen creating a charge imbalance that causes the hydrogen surrounding the water molecule to aggregate to neutralize the the charge imbalance  forming the bases for the strong hydrogen bonds.

Therefore water is a liquid at room temperature while ammonia is a gas due to the difference in strength of their inter-molecular forces.

The intermolecular forces in water are stronger than the intermolecular forces in ammonia.

The intermolecular forces hold substances together in a particular state of matter. There are three states of matter;

The strongest degree of intermolecular interaction occurs between matter in the solid state. weaker intermolecular interactions occur in the liquid state and the weakest intermolecular interaction occurs in the gaseous state.

Since ammonia is a gas at room temperature, it has weaker intermolecular interaction between its molecules compared to molecules of water at room temperature:

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Answer:

B

Explanation:

The interaction between magnetism and electricity is called electromagnetism. The movement of a magnet can generate electricity. The flow of electricity can generate a magnetic field.

Answer: B: electromagnetism

Explanation:

A changing magnetic field produces an electric current in a wire or conductor.

Answer:

0.10M HCN  <  0.10 M HClO  <  0.10 M HNO₂  < 0.10 M HNO₃

Explanation:

We are comparing acids with the same concentration. So what we have to do first is to determine if we have any strong acid and for the rest ( weak acids ) compare them by their Ka´s ( look for them in reference tables ) since we know the larger the Ka, the more Hydronium concentration will be in these solutions at the same concentration.

HNO₃ is a strong acid and will have the largest hydronium concentration.

HCN  Ka = 6.2 x 10⁻¹⁰

HNO₂ Ka = 4.0 x 10⁻⁴

HClO  Ka = 3.0 x 10⁻⁸

The ranking from smallest to largest hydronium concentration will then be:

0.10M HCN  <  0.10 M HClO  <  0.10 M HNO₂  < 0.10 M HNO₃

Acids are substances that produce hydronium ions in solution.

According to Arrhenius definition, acids are substances that produce hydronium ions in solution. The concentration of these hydronium ions depends on the strength of the H-X bond.

The ease with which the H-X bond is broken to yield the proton is given by the Ka. The Ka is called the acid dissociation constant and shows the degree of ionization of an acid.

A strong acid has a high Ka hence it is completely dissociated in solution. A weak acid has a low Ka hence it dissociates only to a small extent in solution.

Given the equimolar solutions listed in the question, the order of hydronium ion concentration from smallest to largest is; HCN < HClO < HNO2< HNO3.

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Answer:

the value of Kp at 25°C is 2.37 × 10⁻⁴atm³

Explanation:

Given that Kp = 0.116atm

NH₄(NH₂CO₂)(s) ⇄ 2NH₃(g) + CO₂(g)

                               2x atm         xatm

Pt                     =      PNH₃         PCO₂

0.116                =      2x          +        x

0.116                =      3x

x = 0.116/3

x = 0.039 atm

PNH₃ = 2x =2(0.039) = 0.078 atm

PCO₂ = x = 0.039 atm

Now,

KP = PNH₃² × PCO₂

     = 0.078² × 0.039 atm³

     = 2.37  × 10⁻⁴ atm³

the value of Kp at 25°C is 2.37 × 10⁻⁴atm³

Answer:

ground water / leaking storage tanks

The pressure P2 at the temperature which CO2 gets solidifies is 0.857 atm.

Explanation:

The relation between temperature T and the pressure P is that it is proportional to each other.

                                      T ∝ P

As the temperature decreases, the pressure also decreases which is given by

                             T1 / T2 = P1 / P2

At the triple point of water, the temperature equals 273 K.

Consider T1 = 273 K,  P1 = 1.20 atm

The temperature T2 of the CO2 solidifies equals 195 K

                            (273 / 195) = (1.20 / P2)

                              P2 = (195 x 1.20) / 273

                             P2 = 0.857 atm.

The pressure P2 at the temperature which CO2 gets solidifies is 0.857 atm.

Answer:

a) pPCl5 = 0.856 atm

b)pPCl5 = 0.0557 atm

pCl2 = pCl3 = 0.800 atm

c)  Ptotal = 1.66 atm

d) 93.5

Explanation:

Step 1: Data given

Temperature = 600 K

Kp = 11.5

Mass of PCl5 = 2.010 grams

Volume of the bulb = 555 mL = 0.555 L

The bulb is heated to 600 K

Step 2: The balanced equation

PCl5(g) ⇄ PCl3(g) + Cl2(g)

Step 3:

a) pv = nrt

⇒with p = the pressure = TO BE DETERMINED

⇒with V = the volume = 0.555 L

⇒ with n =the number of moles PCl5 = 2.010 grams / 208.24 g/mol = 0.00965 moles

⇒ with R = the gas constant = 0.08206 L*atm/mol*K

⇒ with T = the temperature = 600K

p = (0.00965 *0.08206*600)/0.555

pPCl5 = 0.856 atm

b)

The initial pressures

pPCl5 = 0.856 atm

pCl2 = pCl3 = 0 atm

For 1 mol PCl5 we'll have PCl3 and 1 mol Cl2

The pressure at the equilibrium

pPCl5 = (0.856 -x) atm

pCl2 = pCl3 = x atm

Kp = pPCl3 * pCl2/pPCl5  

11.5 = x*x / (0.856 - x)

11.5 = x²/(0.856- x)

x = 0.8003

pPCl5 = (0.856 -x) atm = 0.0557 atm

pCl2 = pCl3 = x atm = 0.800 atm

c) Since x = 0.8003 and PCl3 and PCl2 are x  

Ptotal = 0.8003 + 0.8003 +0.0557 = 1.66 atm

d)

The degree of dissociation = (x / initial pressure PCl5)

(0.8003/0.856) * 100 = 93.5

Answer:

1.2,dibromoethane is the sha'awa .

The central atom in C2H4Br2 is a carbon (C) atom, with each carbon atom being central to its respective part of the molecule, exhibiting a trigonal planar shape and bond angles of approximately 120°.

The central atom in C2H4Br2 is a C (carbon) atom, with other C, H (hydrogen), and Br (bromine) atoms as surrounding atoms. In this molecule, there are typically two central C atoms which are connected by a double bond, and each C atom has attached hydrogen and bromine atoms. Commonly in molecules, the central atom is the least electronegative element that is not hydrogen or a halogen, as these are usually terminal atoms. In C2H4Br2, each carbon atom is the central atom of its respective part of the molecule, with a trigonal planar shape due to the double bond and the single bonds to hydrogen and bromine. This arrangement leads to bond angles of about 120° around each central C atom.

The number of liters of oxygen formed at STP when 20.8 g of potassium chlorate decomposes is 5.70 L.

Potassium chlorate decomposes according to the following balanced equation:

2KClO3 → 2KCl + 3O2

The molar mass of KClO3 is 122.55 g/mol.

To calculate the number of moles of KClO3, we divide the given mass (20.8 g) by the molar mass:

20.8 g / 122.55 g/mol = 0.1697 mol

According to the balanced equation, for every 2 moles of KClO3, 3 moles of O2 are produced.

Therefore, the number of moles of O2 produced is:

0.1697 mol × (3/2) = 0.2546 mol

At Standard Temperature and Pressure (STP), 1 mole of any gas occupies approximately 22.4 liters.

Therefore, the number of liters of O2 produced at STP is:

0.2546 mol × 22.4 L/mol = 5.70 L

This is an incomplete question, here is a complete question.

Calculating equilibrium concentrations when the net reaction proceeds in reverse Consider mixture C, which will cause the net reaction to proceed in reverse.

The chemical reaction is:

[tex]XY(g)\rightleftharpoons X(g)+Y(g)[/tex]

Concentration(M)        [XY]            [X]            [Y]

(M)initial:                     0.200        0.300      0.300

change:                         +x               -x              -x

equilibrium:             0.200+x      0.300-x     0.300-x

The change in concentration, x, is positive for the reactants because they are produced and negative for the products because they are consumed. Based on a Kc value of 0.140 and the data table given, what are the equilibrium concentrations of XY, X, and Y, respectively?

Answer : The Equilibrium concentrations of XY, X, and Y is, 0.104 M, 0.204 M and 0.204 M respectively.

Explanation :

The chemical reaction is:

                                 [tex]XY(g)\rightleftharpoons X(g)+Y(g)[/tex]

initial:                      0.200      0.300   0.300

change:                    +x             -x           -x

equilibrium:      (0.200+x)  (0.300-x)   (0.300-x)

The equilibrium constant expression will be:

[tex]K_c=\farc{[X][Y]}{[XY]}[/tex]

Now put all the given values in this expression, we get:

[tex]0.140=\frac{(0.300-x)\times (0.300-x)}{(0.200+x)}[/tex]

By solving the term 'x', we get:

x = 0.0963 and x = 0.644

We are neglecting the value of x = 0.644 because the equilibrium concentration can not be more than initial concentration.

Thus, the value of x = 0.0963

Equilibrium concentrations of XY = 0.200+x = 0.200+0.0963 = 0.104 M

Equilibrium concentrations of X = 0.300-x = 0.300-0.0963 = 0.204 M

Equilibrium concentrations of X = 0.300-x = 0.300-0.0963 = 0.204 M

In the context of equilibrium chemistry, a net reaction can proceed in either direction until equilibrium is reached. In this case, mixture C causes the reaction to shift in the reverse direction, thereby increasing the concentration of the reactants and decreasing the concentration of the products. This continues until the forward and reverse reaction rates equalize, achieving a state of equilibrium.

The process being described in your question is related to chemical equilibrium. When we speak about a reaction reaching equilibrium, it describes the point at which the concentrations of reactants and products do not change over time. This doesn't mean the reaction has stopped, but instead, the forward and reverse reactions are happening at the same rate due to the dynamic nature of chemical equilibria. In the case of your query, mixture C will cause the net reaction to proceed in reverse.

Using your example, [XY] represents the reactant and [X] and [Y] represent the products. Since the reaction shifts in the reverse direction, the reactants (the products in the forward reaction) increase, hence the positive change in concentration, 'x'. This process continues until the forward and reverse reaction rates become equal, which signifies the reaction's equilibrium state where concentrations of its reactants and products remain constant.

The aforementioned process is guided by the principle of Le Chatelier's, which states that if a dynamic equilibrium is disturbed by changing the conditions, the position of equilibrium shifts to counteract the change.

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Answer:

secrete cytotoxic substance which triggers apoptosis of target cell.

Explanation:

Cytotoxic T cells have cell surface receptor which recognizes the antigen present on the receptor of target cell. This interaction initiates the process of killing of target cell.

After interaction cytotoxic t cell release cytotoxic substance called granzyme and perforin. Granzyme triggers apoptosis through the activation of caspases or by making the release of cytochrome c and activation of the apoptosome.

Perforin make pores in the cell and its action is similar to complement membrane attack complex. Therefore cytotoxic substances are released by Tc cells which trigger apoptosis of target cell.

Answer : The volume of solution used should be, 12 L

Explanation :

Let the volume of solution be, x

Thus the equation will be:

[tex]25\%\times (x)+40\%\times (18-x)=30\%\times (18)[/tex]

Now solving the term 'x', we get:

[tex]\frac{25}{100}\times (x)+\frac{40}{100}\times (18-x)=\frac{30}{100}\times (18)[/tex]

[tex]0.25\times (x)+0.4\times (18-x)=0.3\times (18)[/tex]

[tex]0.25x+7.2-0.4x=5.4[/tex]

[tex]-0.15x=-1.8[/tex]

[tex]0.15x=1.8[/tex]

[tex]x=12[/tex]

Thus, the volume of solution used should be, 12 L

Answer:

Explanation:

Applying the Heisenberg uncertainty principle,

Δx X mΔv = h/4π

where Δx = uncertainty in measurement of position

Δv = uncertainty in measurement of velocity

m = mass of object

h = planck's constant

Here:

Δv = 0.4 A° = 4.0 x 10^-11 m

mass, m = 9.11 x 10^-31 Kg

Plugging the values,

4.0 x 10^-11 x Δ v = (6.626 x 10^-34) / (4 x 3.14 x 9.11E-31)

4.0 x 10^-11 x Δ v = 5.791 x 10^-5

Δv = 1.448 x 10^6 m/s, the uncertainty in its velocity

Answer = 1.45 x 10^6 m/s

The uncertainty in an electron's velocity, given an uncertainty in its position, is calculated using the Heisenberg Uncertainty Principle. By applying the principle's formula with the given position uncertainty and known electron mass, we can determine the minimum uncertainty in the electron's velocity.

The question pertains to the Heisenberg Uncertainty Principle which is a fundamental concept in quantum physics that describes the limit to the precision with which certain pairs of physical properties of a particle, such as position and momentum, can be known simultaneously. To find the uncertainty in velocity, we use the principle's formula ΔxΔp >= ĩ/2, where Δx is the uncertainty in position, Δp is the uncertainty in momentum, and ĩ is the reduced Planck's constant (about 1.055 × 10-34 Js). Since momentum is mass times velocity (p = mv), the uncertainty in velocity (Δ4v) can be found by rearranging the formula to Δ4v >= (ĩ/(2mΔ4x)).

Given that the uncertainty in the position (Δ4x) is 0.4 Å, which is 0.4 × 10-10 meters, and assuming the electron's mass (m) as 9.11 × 10-31 kg, we can calculate the minimum uncertainty in the electron's velocity using the formula.

Remember, this is a simplification and in real-world applications, one would need to account for other factors that could affect the measurement.

Answer:

The answers I think you are looking for is Gasoline or Fuel (chemical energy)

Explanation:

Energy transformation involves change or conversion of energy from one form to another. Having two examples of the same form of chemical energy, convert into two or more types of energy, the best example would be gasoline.

GASOLINE/FUEL → CAR BATTERY + LIGHT BULBS (TRAFFICATOR LIGHT)

(chemical)                     (electrical)               (radiant)

GASOLINE/FUEL → INTERNAL COMBUSTION ENGINE

(chemical)                   (mechanical)

Answer:

C - result in radiant energy

Explanation:

Answer:

= 238.6J

Explanation:

According to the law of conservation of energy, energy can neither be created nor be destroyed. It can only be transformed from one form to another.

Endothermic reactions are those in which heat is absorbed by the system and thus the energy of products is higher than the energy of reactants.

For the given reaction:

A + B ⇄ C + D

Energy of A = 85.1 J

Energy of B = 87.9 J

Product C contains 38.7 J

Energy balance:  

∑ enthalpy of the reactants + energy added = ∑ enthalpy of the products + energy released.

∑ enthalpy of the reactants = 85.1 J + 87.9 J = 173 J

energy added = 104.3 J

∑ enthalpy of the products = 38.7 J + D

energy released = 0

Equation:

173J + 104.3J = 38.7 + D + 0  

⇒ D = 173J + 104.3J - 38.7J

= 238.6J

which is the chemical energy of the product D

Product D must contain 238.6 J of chemical energy based on the principles of energy conservation in a chemical reaction.

In a chemical reaction, the law of conservation of energy states that energy cannot be created or destroyed; it can only change forms. This principle applies to chemical energy as well. Therefore, the total energy in the reactants must equal the total energy in the products.

Let's analyze the given information and calculate the chemical energy in product D:

Reactant A contains 85.1 J of chemical energy.

Reactant B contains 87.9 J of chemical energy.

Product C contains 38.7 J of chemical energy.

The total initial chemical energy in the reactants (A and B) is:

Initial Energy (A + B) = 85.1 J + 87.9 J = 173.0 J

The reaction absorbs 104.3 J of chemical energy as it proceeds. This means that the total energy in the products (C + D) must be equal to the initial energy plus the absorbed energy:

Total Energy in Products (C + D) = Initial Energy (A + B) + Absorbed Energy

Total Energy in Products (C + D) = 173.0 J + 104.3 J = 277.3 J

Now, we know the total energy in the products (C + D) is 277.3 J, and we already know the energy in product C is 38.7 J. To find the energy in product D, we can subtract the energy in C from the total energy in the products:

Energy in Product D = Total Energy in Products - Energy in Product C

Energy in Product D = 277.3 J - 38.7 J = 238.6 J

Therefore, product D must contain 238.6 J of chemical energy.

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Answer:

42 liters

Explanation:

Let the volume of 2% sulfuric acid required be X while that of 12% sulfuric acid required be Y.

According to the concentration: 0.02X + 0.12Y = 0.05(X + Y).......equation 1

According to the volume: X + Y = 60...............equation 2

Substitute equation 2 into equation 1.

0.02X + 0.12(Y) = 0.05(60)

2X + 12Y = 300

X + 6Y = 150..............................equation 3

From equation 2, Y = 60 -X...................equation 4

Substitute equation 4 into equation 3.

X + 6(60-X) = 150

X + 360 - 6X = 150

-5X = -210

X = 42

Hence, the volume of 2% sulfuric acid required is 42 liters.

Answer:

Double bond

Explanation:

an alkene is a unsaturated hydrocarbon which means that it contain at least one double bond

Answer:

The answer to your question is B. double bond.

Explanation:

Both alkanes and alkenes are hydrocarbons composed by carbon and hydrogen.

The different between these compounds is that alkanes have only single bonds are are represented as:         H    H

                                                            |     |

                                                     H - C - C - H

                                                            |      |

                                                           H    H

Alkenes have at least one double bound in their structure and are represented as

                                                   H - C = C - H

                                                          |      |

                                                          H    H

Answer:

4.332 millimoles of NaOH

Explanation:

Molarity (M) = moles per liter (mole/L); liters x moles/liter = moles

0.04332 L x 0.1 mole/liter = 0.004332 moles of NaOH (4.332 millimoles)

millimoles / milliliters = moles/liter = molarity (M).

4.332 millimoles / 50 milliliters = 0.08664 M HCl

In the Volumetric titration at the end point, moles of NaOH = moles of HCl

NaOH + HCl --> H2O + NaCl

Answer: The percent change in volume will be 25 %

Explanation:

To calculate the final temperature of the system, we use the equation given by Charles' Law. This law states that volume of the gas is directly proportional to the temperature of the gas at constant pressure.

Mathematically,

[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]

where,

[tex]V_1\text{ and }T_1[/tex] are the initial volume and temperature of the gas.

[tex]V_2\text{ and }T_2[/tex] are the final volume and temperature of the gas.

We are given:

[tex]V_1=2L\\T_1=T_1\\V_2=?\\T_2=75\% \text{ of }T_1=0.75\times T_1[/tex]

Putting values in above equation, we get:

[tex]\frac{2L}{T_1}=\frac{V_2}{0.75\times T_1}\\\\V_2=\frac{2\times 0.75\times T_1}{T_1}=1.5L[/tex]

Percent change of volume = [tex]\frac{\text{Change in volume}}{\text{Initial volume}}\times 100[/tex]

Percent change of volume = [tex]\frac{(2-1.5)}{2}\times 100=25\%[/tex]

Hence, the percent change in volume will be 25 %

Answer:

a positive charge of +1

Explanation:

The charge carried by atom depends on the number of protons and electrons present. The neutrons are not charged hence they do not contribute to the net charge of the specie.

The specie mentioned in the question has six protons and five electrons. Hence it has an excess of one positive charge hence a net charge of +1.

Answer:

minerals

Explanation:

A potted geranium is plant that is capable of manufacturing complex carbohydrates from sugar synthesized through the process of photosynthesis.

The process of photosynthesis primarily requires water and carbohydrate together with resources such as essential minerals. Hence, when a plant food is added to a plant, the most plausible term this refers to is minerals. This is because food contains minerals necessary for various metabolic activities of living organisms.

Final answer:

The equilibrium concentration of [[tex]S_2[/tex]] is [tex]1.12 \times 10^{-3} M[/tex].

Explanation:

To find the equilibrium concentration of [[tex]S_2[/tex]], we need to use the equilibrium constant expression [tex]\( K_c = \frac{{[H_2]^2[S_2]}}{{[H_2S]^2}} \)[/tex]. Given the initial concentrations of [tex]H_{2}S[/tex] and [tex]H_2[/tex], and assuming x moles of [tex]H_{2}S[/tex] decompose, we can set up an ICE table and solve for the equilibrium concentrations. Substituting the equilibrium concentrations into the equilibrium constant expression and solving for [[tex]S_{2[/tex]], we find the equilibrium concentration to be [tex]1.12 \times 10^{-3} M[/tex]. This indicates the concentration of [tex]S_2[/tex] at equilibrium after the reaction has reached its dynamic equilibrium state at 800°C.

Explanation:

The relation between [tex]K_a\&K_b[/tex] is given by :

[tex]K_w=K_a\times K_b[/tex]

Where :

[tex]K_w=1\times 10^{-14}[/tex] = Ionic prodcut of water

The value of the first ionization constant of sodium sulfite = [tex]K_{a1}=1.4\times 10^{-2}[/tex]

The value of [tex]K_{b1}[/tex]:

[tex]1\times 10^{-14}=1.4\times 10^{-2}\times K_{b1}[/tex]

[tex]K_{b1}=\frac{1\times 10^{-14}}{1.4\times 10^{-2}}=7.1\times 10^{-13}[/tex]

The value of the second ionization constant of sodium sulfite = [tex]K_{a2}=6.3\times 10^{-8}[/tex]

The value of [tex]K_{b2}[/tex]:

[tex]1\times 10^{-14}=6.3\times 10^{-8}\times K_{b1}[/tex]

[tex]K_{b1}=\frac{1\times 10^{-14}}{6.3\times 10^{-8}}=1.6\times 10^{-7}[/tex]

Final answer:

To find the equilibrium constant for the ionization of HSO4−, we use the equilibrium concentrations of H3O+, HSO4−, and SO42− in the given reaction formula to compute Ka.

Explanation:

To compute the equilibrium constant for the ionization of the HSO4− ion, we need to use the expression for the equilibrium constant (Ka) which is based on the concentrations of products over reactants, excluding water because its concentration is considered constant in dilute aqueous solutions. The given equilibrium is HSO4−(aq) + H2O(l) ⇒ H3O+(aq) + SO42−(aq). Given equilibrium concentrations are [H3O+] = 0.027 M, [HSO4−] = 0.29 M, and [SO42−] = 0.13 M. Hence, the equilibrium constant (Ka) is calculated as Ka = [H3O+][SO42-−]/[HSO4−] = (0.027)(0.13)/(0.29).

Answer: Volume of the balloon at this altitude is 46.9 L

Explanation:

Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.

The combined gas equation is,

[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]

where,

[tex]P_1[/tex] = initial pressure of gas = 737 mm Hg

[tex]P_2[/tex] = final pressure of gas =  385 mm Hg

[tex]V_1[/tex] = initial volume of gas = 28.6 L

[tex]V_2[/tex] = final volume of gas = ?

[tex]T_1[/tex] = initial temperature of gas = [tex]26.8^oC=273+26.8=299.8K[/tex]

[tex]T_2[/tex] = final temperature of gas = [tex]-16.3^oC=273-16.3=256.7K[/tex]

Now put all the given values in the above equation, we get:

[tex]\frac{737\times 28.6}{299.8}=\frac{385\times V_2}{256.7}[/tex]

[tex]V_2=46.9L[/tex]

Thus the volume of the balloon at this altitude is 46.9 L

Answer : The final temperature of the aluminum is, [tex]155.9^oC[/tex]

Explanation :

Formula used :

[tex]q=m\times c\times (T_{final}-T_{initial})[/tex]

where,

q = heat = 3600 cal = 15062.4 J    (1 cal = 4.184 J)

m = mass of aluminum = 125 g

c = specific heat of aluminum = [tex]0.90J/g^oC[/tex]

[tex]T_{final}[/tex] = final temperature = ?

[tex]T_{initial}[/tex] = initial temperature = [tex]22^oC[/tex]

Now put all the given values in the above formula, we get:

[tex]15062.4J=125g\times 0.90J/g^oC\times (T_{final}-22)^oC[/tex]

[tex]T_{final}=155.9^oC[/tex]

Thus, the final temperature of the aluminum is, [tex]155.9^oC[/tex]

Answer:

The mass of 1.00 mol of allicin, rounded to the nearest integer, is 162 g

Explanation:

Allicin is a compound that derivates from the alliin which is produced by the catalyzis of an enzime.

The molecular formula is: C₆H₁₀OS₂.

Let's determine the molar mass which is the mass that corresponds to 1 mol

Molar mass C . 6 + Molar mass H . 10 + Molar mass O + Molar mass S . 2 =

12 g/mol . 6 + 1 g/mol . 10 + 16 g/mol + 32.06 g/mol . 2 =  162.1 g/mol

The mass of 1 mole of allicin has been 162 g.

Allicin has been the organic compound of carbon, hydrogen, and sulfur. It has a molecular formula, [tex]\rm C_6H_10OS_2[/tex].

For the calculation of mass in a mole compound, the molecular mass of the compound has been given as:

[tex]mwt=M_C\;+\;M_H\;+\;M_O\;+\;M_S[/tex]

Where the mass of carbon, [tex]M_C=12\;\rm g/mol[/tex]

The mass of hydrogen, [tex]M_H=1\;\rm g/mol[/tex]

The mass of oxygen, [tex]M_O=16\;\rm g/mol[/tex]

The mass of sulfur, [tex]M_S=32\;\rm g/mol[/tex]

Substituting the values for molar mass of allicin as:

[tex]mwt=(6\;\times\;12)\;+\;(10\;\times\;1)\;+\;(1\;\times\;16)\;+\;(2\;\times\;32)\\mwt=72\;+\;10\;+\;16\;+\;64\;\text{g/mol}\\mwt=162\;\text{g/mol}[/tex]

The molar mass of allicin has been 162 g/mol.

The mass of 1 mole sample has been given as:

[tex]\rm Mass=moles\;\times\;\textit {mwt}[/tex]

Substituting the values for the mass of allicin as:

[tex]\rm Mass=1\;mol\;\times\;162\;g/mol\\Mass=162\;g[/tex]

The mass of 1 mole of allicin has been 162 g.

For more information about moles, refer to the link:

https://brainly.com/question/20674302

Answer : The value of new volume is, 50.0 mL

Explanation :

Boyle's Law : It is defined as the pressure of the gas is inversely proportional to the volume of the gas at constant temperature and number of moles.

[tex]P\propto \frac{1}{V}[/tex]

or,

[tex]P_1V_1=P_2V_2[/tex]

where,

[tex]P_1[/tex] = initial pressure at STP = 1 atm

[tex]P_2[/tex] = final pressure =  4.00  atm

[tex]V_1[/tex] = initial volume at STP = 200.0 mL

[tex]V_2[/tex] = final volume = ?

Now put all the given values in the above equation, we get:

[tex]1atm\times 200.0mL=4.00atm\times V_2[/tex]

[tex]V_2=50.0mL[/tex]

Therefore, the value of new volume is, 50.0 mL