A student is titrating 50 mL of 0.32 M NH3 with 0.5 M HCl. How much hydrochloric acid must be added to react completely with the ammonia?

Answer:

92.41 g

Explanation:

Answer: He should order 92.41g of the limiting reactant.

Answer: 21.6 mol of Fe

Explanation:

Fe2O3 + 3 CO → 2 Fe + 3 CO2

32.4 mol CO  x  __2 mol Fe__  =  21.6 mol of Fe

                              3 mol CO

Answer:

6.09 M

Explanation:

M(HCl) = 1 +35.5 = 36.5 g/mol

85.6 g * 1 mol/36.5 g = 2.3452 mol HCl

Molarity = mol solute/ L solution = 2.3452 mol/0.385 L = 6.09 mol/L =6.09 M

The number of moles of HCl in 85.6 g is 2.35 moles. Then, the molarity of the 385 ml or 0.385 L solution is 6.10 M

The molarity of a solution is the ratio of the number of moles of its solutes to the volume of solution in liters. It is the common term to express the concentration of a solution.

To find the molarity of the solution, we need to first calculate the number of moles of HCl in the solution, using the formula:

moles = mass / molar mass

where mass is the mass of the solute (hydrochloric acid) and molar mass is the molecular weight of the solute.

The molecular weight of HCl is approximately 36.5 g/mol (1.008 g/mol for hydrogen and 35.5 g/mol for chlorine).

So, the number of moles of HCl in 85.6 g of HCl is:

moles = 85.6 g / 36.5 g/mol = 2.35 mol

Next, we need to calculate the volume of the solution in liters:

385 mL = 0.385 L

Finally, we can calculate the molarity of the solution using the formula:

molarity = moles of solute / liters of solution

molarity = 2.35 mol / 0.385 L ≈ 6.10 M

Therefore, the molarity of the solution produced is approximately 6.10 M.

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Options:

Answer: NaOH (aq)

Explanation:

Defining state terminologies, 'aq' means aqueous, meaning the analyte is in solution, as opposed to gaseous (g), or liquid (l).

In mathematics, a solution typically refers to the numeric value(s) that satisfy an equation or inequality. For example, in the equation 'x + 3 = 7', the solution is x = 4. In a quadratic equation 'ax^2 + bx + c = 0', the solution(s) for x can be found using the quadratic formula x = [-b ± sqrt(b^2 - 4ac)] / 2a.

The term 'solution', in the context of mathematics, typically refers to the process of determining the values that satisfy an equation or inequality. In the most simplistic cases, a 'solution' represents a numeric value that, when substituted into the equation, equates both sides. For instance, in the equation 'x + 3 = 7', the solution would be x = 4. This is because substituting x = 4 into the equation yields a true statement (4 + 3 does indeed equal 7).

In a more complex scenario, such as the quadratic equation 'ax^2 + bx + c = 0', you would use the quadratic formula x = [-b ± sqrt(b^2 - 4ac)] / 2a to find the solution(s) for x.

However, it should be noted that not all formulas are 'solutions'. Some formulas might represent a general principle or pattern, rather than a specific solution to an equation.

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The speed of the plane in cloudy skies is calculated by subtracting the lesser distance it covers in such conditions from its usual distance (3952km - 184km = 3768), and then dividing by the given time which is 3 hours. The speed is thus 1256 km/h.

To calculate the speed of the plane flying in cloudy skies, we first need to establish the number of kilometers the plane usually flies which is 3952 km. In cloudy conditions, it covers 184 km less, so we subtract that from the usual distance (3952 - 184 = 3768 km). The time is still 3 hours. Speed is calculated by dividing the distance by the time. That gives us 3768 km / 3 hours = 1256 km/h.

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Answer:

The mass of water vapor is 44.46 grams

The volume of water is 30.37 L

Explanation:

Step 1: Data given

Mass of CH3OH =42.5 grams

Molar mass CH3OH = 32.04 g/mol

Volume of O2 = 22.8 L

Pressure = 2.00 atm

Step 2: The balanced equation

2CH3OH + 3O2 → 2CO2 + 4H2O

Step 3: Calculate moles CH3OH

Moles CH3OH = mass CH3OH / molar mass CH3OH

Moles CH3OH = 42.5 grams / 32.04 g/mol

Moles CH3OH = 1.326 moles

Step 4: Calculate moles O2

p*V = n*R*T

⇒with p = the pressure = 2.00 atm

⇒with V = the volume of O2 = 22.8 L

⇒with n = the moles of O2  = TO BE DETERMINED

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

⇒with T = the temperature = 27 °C = 300 K

n = (p*V) / (R*T)

n = (2.00 * 22.8) / (0.08206*300)

n = 1.85 moles

Step 5: Calculate the limiting reactant

For 2 moles CH3OH we need 3 moles O2 to produce 2 moles CO2  and 4 H2O

O2 is the limiting reactant. It will completely be consumed ( 1.85 moles). CH3OH is in excess. There will react 2/3*1.85 = 1.233 moles. There will remain  1.326 - 1.233 = 0.093 moles

Step 6: Calculate moles products

For 2 moles CH3OH we need 3 moles O2 to produce 2 moles CO2  and 4 H2O

For 1.85 moles O2 we'll have 1.233 moles CO2 and 2.467 moles H2O

Step 7: Calculate mass H2O

Mass H2O = moles H2O * molar mass H2O

Mass H2O = 2.467 moles * 18.02 g/mol

Mass H2O = 44.46 grams

Step 8: Calculate volume H2O

p*V = n*R*T

⇒with p = the pressure = 2.00 atm

⇒with V = the volume of H2O = TO BE DETERMINED

⇒with n = the moles of H2O  = 2.467 moles

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

⇒with T = the temperature = 27 °C = 300 K

V = (n*R*T)/p

V = (2.467 * 0.08206 * 300) / 2.00

V = 30.37 L

The mass of water vapor is 44.46 grams

The volume of water is 30.37 L

Answer:

1.125

Explanation:

pH = -log[H+]

pH = -log(0.075)

pH = 1.125

Answer:

The correct answer to the following question will be Option E (1.0 x 10⁻³ M).

Explanation:

The given values are:

[tex]A\lambda =140[/tex]

[tex]\varepsilon=1.36\times 10^5 \ M \ {cm^{-1}}[/tex]

L = 1 \ cm

As we know,

⇒  [tex]A\lambda=\varepsilon CL[/tex]

On putting the given values in the above formula, we get

⇒  [tex]140=1.36\times 10^5\times C\times 1[/tex]

⇒  [tex]C=\frac{140}{1.36\times 10^5}[/tex]

⇒  [tex]C=102.9\times 10^{-5} \ M[/tex]

So that option E is the right answer.

The concentration of a Beta-carotene solution with an absorbance of 140 at a path length of 1 cm is calculated as approximately 1.0 x 10⁻³ M using the Beer-Lambert law.

The question is asking for the concentration of a Beta-carotene solution based on its absorbance at a wavelength of 490 nm using the Beer-Lambert law. According to the Beer-Lambert law, absorbance (A) is equal to the molar absorptivity () times the concentration of the solution (c) times the path length (b):

A = c b

Given the values:

Absorbance (A) = 140

Molar absorptivity () = 1.36 x 105 M⁻¹cm⁻¹

Path length (b) = 1 cm

We can rearrange the equation to solve for concentration (c):

c = A / (b)

Plugging in the given values:

c = 140 / (1.36 x 105 x 1)

Concentration (c) = 1.0294117647 x 10⁻³ M, which can be approximated to 1.0 x 10⁻³ M based on the given options.

Hence, the concentration of Beta-carotene solution with an absorbance of 140 at a path length of 1 cm is 1.0 x 10⁻³ M.

Answer:

Its D

Explanation:

Because 1 nitrogen atom is N2 and theres an N2 in all of those

Formulas I, II, and III each contain an equal number of nitrogen atoms.

To determine which formulas contain an equal number of nitrogen atoms, we need to count the number of nitrogen atoms in each formula.

From the count, we can see that formulas I, II, and III each contain an equal number of nitrogen atoms.

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Explanation:

exothermic reaction is a chemical reaction which involves the liberation of heat to the surroundings while endothermic reaction is a chemical reaction that involves the absorption of heat from the surroundings

Answer:

Exothermic= outside

Endothermic= inside

Explanation:

Answer:

110

Explanation:

Answer:

You see things happen much sooner than you hear them.  

Explanation:

Light travels about a million times as fast as sound.

When the ball hits the bat , it will take about a million times longer to hear the crack of the bat than to see it.

What you see is almost instantaneous.

There will be a delay until you hear the sound.

Answer:

about 19 or 20 g

Explanation:

To do this, is neccesary to watch a solubility curve of this compound. This is the only way that you can know how many grams are neccesary to dissolve this compound in 50 mL of water to a given temperature.

Now, if you watched the attached graph, you can see the solubility curve of many compounds in 100 g of water (or 100 mL of water). So, to know how many do you need in 50 mL, it's just the half.

So watching the curve, you can see that at 20 °C, we simply need between 35 g and 40 g. Let's just say we need 38 grams of NH4Cl to be dissolved in 100 mL of water.

So, in 50 mL, it's just the half. So, we only need 19 g or 20 g of NH4Cl at 20 °C, to dissolve this compound in water.

Deforestation leads to increased carbon dioxide levels in the atmosphere by preventing trees from absorbing it and releasing stored carbon dioxide back into the air.

Deforestation significantly impacts carbon dioxide levels in the atmosphere. When trees are cut down, they can no longer remove carbon dioxide from the atmosphere, leading to an increase in carbon dioxide levels. Additionally, burning trees releases stored carbon dioxide back into the atmosphere, further contributing to the greenhouse effect and climate change.

Carbon dioxide is a greenhouse gas that has increased global warming. The carbon dioxide emissions can be reduced by planting more trees to absorb carbon dioxide. Thus, option B is correct.

Carbon dioxide is a greenhouse gas present in the atmosphere and plays an important role in absorbing UV radiation. The increased carbon emissions due to pollution and deforestation have led to an increase in the temperature of the planet. This has resulted in climate change due to global warming.

This effect of carbon emission can only be reduced if more plantation is done to soak up the carbon present in the atmosphere. Plants take carbon dioxide from the surroundings to produce food and oxygen and can help reduce global warming and pollution.

Therefore, option B. more plantations can decrease carbon emissions.

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The best option for reducing carbon dioxide emissions among those provided is B. Planting more trees. Trees act as a carbon sink and absorb CO₂, aiding in the reduction of atmospheric carbon levels.

Among the options provided for reducing carbon dioxide emissions, the correct choice is B. Planting more trees. Trees absorb carbon dioxide from the atmosphere during the process of photosynthesis, which helps to reduce overall concentrations of this greenhouse gas. Additionally, measures such as burning less fossil fuels and increasing carbon sinks like forests can further help remove CO₂ from the atmosphere. However, other options such as generating electricity from coal, which is more carbon-intensive than oil, or cutting down trees would increase carbon emissions rather than reduce them.

To effectively reduce CO₂ emissions, reducing deforestation, increasing afforestation and reforestation, and shifting to cleaner energy sources like solar, wind, and biomass are also crucial strategies. These actions, combined with policies like capping emissions and promoting sustainable agricultural practices, can significantly lower the atmospheric concentration of carbon dioxide.

Final answer:

The positive ion found in aqueous sulfuric acid (H2SO4) is the hydronium ion (H3O+), which forms during the acid's ionization in water.

Explanation:

The positive ion found in H2SO4(aq) is the hydronium ion (H3O+). When sulfuric acid (H2SO4) is dissolved in water, the first ionization results in the formation of hydronium ions (H3O+) and hydrogen sulfate ions (HSO4−). The second ionization of the hydrogen sulfate ion can produce more hydronium ions and sulfate ions (SO42−). Since we are discussing only positive ions, the hydronium ion is the relevant ion in both ionization steps of sulfuric acid in an aqueous solution.

The ammonium ion (NH4+), sulfide ion (S2−), and hydroxide ion (OH−) are not relevant in the context of sulfuric acid in aqueous solution.

In aqueous sulfuric acid, the only positive ion present is the 2. hydronium ion (H₃O⁺).

In the aqueous solution of sulfuric acid, H₂SO₄(aq), the only positive ion that is found is the hydronium ion (H₃O⁺).

When sulfuric acid (H₂SO₄) is dissolved in water, it undergoes ionization:

First ionization: H₂SO₄(aq) + H₂O(l) ⇒ H₃O+(aq) + HSO₄⁻(aq)

Second ionization: HSO₄⁻(aq) + H₂O(l) ⇒ H₃O⁺(aq) + SO₄²⁻(aq)

This ionization process results in the formation of hydronium ions (H₃O⁺), making them the only positive ions in the solution. The correct answer is 2.

Answer:

The number of atoms  in 10 g of Pb is 2.9064 × 10²² atoms

Explanation:

According to Avogadro's constant, one mole of a substance contains exactly 6.02214076 × 10²³ particles such as molecules, atoms or ions.

Here we have lead, Pb, which is an uncombined element, therefore, the number of moles present in 10 g of lead can be found as follows;  

Molar mass of lead = 207.2 g/mol

Mass of lead sample = 10 g

[tex]Number \, of \, moles, \, n, \, of \, lead \, present = \frac{Mass \, of \, lead}{Molar \, mass \, of \, lead} = \frac{10 \, g}{207.2 \, g/mol} = 0.04826 \ moles[/tex]

Therefore, number of atoms in 10 g of lead is found by multiplying the number of moles by the Avogadro's number as follows;

Number of atoms = Number of moles × Avogadro's number

∴ Number of atoms  in 10 g of Pb = 0.04826 × 6.02214076 × 10²³ = 2.9064 × 10²² atoms.

The number of atoms  in 10 g of Pb = 2.9064 × 10²² atoms.

Answer:

2.9 ×10^22 atoms of lead.

Explanation:

Now, we have to make use of the Avogadro's number. Remember that according to professor Avogadro, the mole refers to the amount of substance that contains the same number of elementary entities as 12 grams of carbon-12.

The number of elementary particles (atoms, ions, molecules etc) present is one mole of a substance is equal to the Avogadro's number. Hence one mole of a substance contains Avogadro's number of elementary entities.

Now one mole of lead has a mass of 207.2 gmol-1. One mole of lead contains 6.02×10^23 atoms (Avogadro's number) of atoms.

Hence if 207.2 g of lead contains 6.02×10^23 atoms of lead

10.0 g of lead will contain 10.0 × 6.02×10^23 / 207.2 = 2.9 ×10^22 atoms of lead.

Hence 10.0g of lead contains 2.9 ×10^22 atoms of lead.

Answer:

Pressure of the Oxygen gas collected over water at 23.5°C = 728.35 mmHg = 0.958 atm

Explanation:

The gas collected over water will mix with water vapour.

The total pressure of the setup is then a sum of the partial pressure of the gas collected over the water and the vapour pressure of water at the temperature given.

Total Pressure = (Partial Pressure of Oxygen) + (Vapour Pressure of water at 23.5°C)

Total Pressure = 750 mmHg

Partial Pressure of Oxygen = ?

Vapour Pressure of water at 23.5°C = 21.6472 mmHg from literature

750 = (Partial Pressure of Oxygen) + 21.6472

Partial Pressure of Oxygen = 750 - 21.6472 = 728.3528 mmHg = 0.958 atm

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Potassium Nitrate (KNO3) is a potassium compound containing both ionic and covalent bonds. The bond between K+ and NO3- is ionic while the bonds within the nitrate ion are covalent.

An example of a potassium compound containing both ionic and covalent bonds is potassium nitrate (C). In potassium nitrate (KNO3), the bond between the potassium ion (K+) and the nitrate ion (NO3-) is ionic. Within the nitrate ion itself, the bonds between the nitrogen atom and the oxygen atoms are covalent.

Ionic bond forms when one atom transfers one or more electrons to another atom; in this case, potassium (K) transfers one electron to nitrate (NO3) ion. Covalent bond on the other hand occurs when two atoms share electrons, as seen in the bonding between nitrogen (N) and oxygen (O) atoms within the nitrate ion (NO3).

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Answer:

the ph is 13.54

ur welcome

Explanation:

Based on the data provided, the pH of the H2SO4 solution is 1.62

The pH of a solution is the negative logarithm to base ten of the hydrogen ions concentration of the solution .

Mathematically, pH = - log [H+]

The pH is calculated from the molarity of the solution.

number of moles of H2SO4 = 3.25/98.08 = 0.0331 moles

Molarity of the H2SO4 solution = 0.0331/2.75 = 0.012 M

Since H2SO4 us a diprotic acid, [H+] = 2 × 0.012 = 0.024

Then;

pH = -log(0.024)

pH = 1.62

Therefore, the pH of the H2SO4 solution is 1.62

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It showed that the richest Harappan citizens had excess food to trade or sell. It showed that Harappa could store excess food to save, sell, or trade with others.

Answer:

THE MOLARITY OF SODIUM CHLORIDE IN THE CONTAINER IS 0.3846 M.

Explanation:

Molarity of a solution is the number of moles of solute per dm3  of solution.

Mass concentration = Molar concentration * Molar mass

1. calculate the mass concentration;

Mass conc. = 45 g in 2 L

= 45 g in 2 dm3

In 1 dm3, the mass will be 45 / 2

= 22.5 g/dm3 of NaCl.

2. Calculate the molar mass;

(Na = 23, Cl = 35.5)

Molar mass = ( 23 + 35.5 ) g/mol

Molar mass = 58.5 g/mol

3. calculate the molarity

Molarity = mss concentration / molar mass

Molarity = 22.5 g/dm3 / 58.5 g/mol

Molarity = 0.3846 mol/dm3 of NaCl.

The molarity of sodium chloride in the container is 0.3846 mol/dm3

Answer:

Gene disorders require the inheritance of a defective gene from each parent

Answer:

300N

Explanation:

Mass = 100kg

Acceleration = 3m/s²

Force = mass × acceleration

F = ma

Force = 100 × 3

Force = 300N

The force required to move 100kg of barbell with an acceleration of 3m/s² is 300N

Answer:

The correct answer to the following question will be Option B (temperature of the water).

Explanation:

Final answer:

The solubility of a salt in water is primarily determined by the temperature, with most solutes having increased solubility at higher temperatures. This greatly influences the maximum amount of solute that can dissolve, making temperature a key factor in solubility. The correct answer is B.

Explanation:

The solubility of a salt in a given volume of water depends primarily on the B) temperature of the water. This is because solubility is significantly influenced by temperature, with most solid or liquid solutes having their solubility increased with rising temperature. The solubility of sodium chloride, for example, is 36.0 g per 100 g of water at 20°C, underscoring the need to specify temperature when discussing solubility. While surface area affects the rate of dissolution and stirring can increase the rate of solute-solvent collisions, it is the temperature that primarily determines the maximum amount of solute that can dissolve. Pressure, on the other hand, has a prominent effect on the solubility of gases rather than salts in water.

Answer:

B

Explanation:

Since we want to find the volume of CO, but we're given Nickel's mass, we need to convert grams of Nickel to moles then convert that to moles of CO using stoichiometry from the balanced reaction.

The molar mass of Nickel is 58.69 g/mol:

[tex]18.9 g Ni *\frac{1mol}{58.69gNi} =0.322molNi[/tex]

From the reaction, we can see that each mole of Nickel is 4 moles of CO, so to find the number of moles of CO from 0.322 moles of Nickel, multiply 0.322 by 4: 0.322 * 4 = 1.29 mol CO

Now, we can use the ideal gas law, PV = nRT, to find the volume of CO:

- the pressure P is 2.99 atm

- the volume is what we want to find

- the moles n is 1.29 mol CO

- the gas constant R here would be 0.08206 L atm / (mol K)

- the temperature T is 340.°C + 273 = 613 K

Plug all these values in:

PV = nRT

(2.99 atm) * V = (1.29 mol) * (0.08206) * (613 K)

V ≈ 21.7 L

The answer is B

Answer:

D. 1

Explanation:

Hydrogen is the chemical element with the symbol H and atomic number 1. With a standard atomic weight of 1.008, hydrogen is the lightest element in the periodic table. Hydrogen is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass.

Answer:

D.1 is the correct answer

Explanation:

hydrargyrum , hg swiftplanet, quicksliver

Explanation:

Answer:

Mercury is used in thermometers, barometers, manometers, sphygmomanometers, float valves, mercury switches, mercury relays, fluorescent lamps and other devices, though concerns about the element's toxicity have led to mercury thermometers and sphygmomanometers being largely phased out in clinical environments in favor ...

Explanation:

i know this will help because i got this right

Answer:

Earth's Core!