A sample of hydrogen gas was collected over water at 21ºc and 685 mmhg. the volume of the container was 7.80 l. calculate the mass of h2(g) collected. (vapor pressure of water = 18.6 mmhg at 21c.)
The mass of H2(g) collected is approximately calculated as 0.582 grams. This result is found by subtracting the water's vapor pressure from the total pressure, applying the ideal gas law to find the number of moles, and converting moles to grams.
Explanation:To calculate the mass of H2(g) collected, we'll first need to calculate the pressure of the dry hydrogen gas. The pressure of a gas collected over water is a sum of the pressure of the dry gas and the vapor pressure of the water. Hence, the pressure of dry H2(g) is the total pressure minus the water vapor pressure, so 685 mmHg - 18.6 mmHg = 666.4 mmHg.
Next, we convert this pressure into atmospheres: 666.4 mmHg * (1 atm / 760 mmHg) = 0.877 atm (approximately). We'll also need to convert the temperature to Kelvin: 21ºC + 273 = 294 K.
Then, we can use the ideal gas law, PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant (0.0821 L*atm/K*mol), and T is temperature. Solving for n, n = PV / RT, we substitute the known values to get n = (0.877 atm * 7.80 L) / (0.0821 L*atm/K*mol * 294 K) = 0.291 mol.
Last, we turn moles of H2 into grams. As the molar mass of H2(g) is approximately 2 g/mol, the mass of H2(g) collected is 0.291 mol * 2 g/mol = 0.582 grams.
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Calculate the number of moles in 41.5 g of MgCl2
To find the number of moles of MgCl₂ in 41.5 g, you divide the mass of the substance by its molar mass. The molar mass of MgCl₂ is 95.21 g/mol, resulting in 0.436 moles of MgCl₂.
To calculate the number of moles of MgCl₂ in 41.5 g, you need to know the molar mass of MgCl₂.
The molar mass is the sum of the mass of one mole of magnesium (Mg) ions and two moles of chloride (Cl) ions.
The molar mass of Mg is 24.305 g/mol and the molar mass of Cl is 35.45 g/mol.
Therefore, the molar mass of MgCl₂ is (1 × 24.305) + (2 × 35.45) = 95.21 g/mol.
Next, use the formula: Number of moles = Mass of substance (g) / Molar mass (g/mol)
Number of moles of MgCl₂ = 41.5 g / 95.21 g/mol = 0.436 moles of MgCl₂.
Rewrite the following numbers in scientific notation.
Why is it unlikely to find pure alkali metals in nature?
Answer: High Reactivity
Explanation: Alkali metals are the metals which are kept in the group 1 which is also known as S -Block elements.
The electronic configuration of the elements can be written as ns1 .
These are considered to be the most reactive elements of the whole periodic table because their outermost shell has only 1 vacant electron and thus are in need of only 1 electron to complete its duplet or either they can also lose that one electron .
This the reason they can never be found pure in the nature .
What is the ph of a solution that is 0.06 m in sodium benzoate (nac7h5o2) and 0.09 m in benzoic acid (hc7h5o2)?
To determine the pH of a solution which has 0.06 m in sodium benzoate (nac7h5o2) and 0.09 m in benzoic acid (hc7h5o2), we use the ICE table and the acid dissociation constant of hc7h5o2 to determine the concentration of the hydrogen ion present at equilibrium. We do as follows:
HC7H5O2 = H+ + C7H5O2-
NaC7H5O2 = Na+ + C7H5O2-
Therefore, the only source of hydrogen ion would be the acid.
We use the ICE table,
HC7H5O2 H+ C7H5O2-
I
0.09 0 0.06
C
-x
+x +x
------------------------------------------------------------------
E
0.09-x x
0.06+ x
Ka = 6.28x10^(-5) = (0.06 + x) (x) / 0.09 -x
x = 9.40x10^-5 M = [H+]
pH = - log [H+]
pH = -log 9.40x10^-5 M
pH = 4.03
Therefore, the pH of
the resulting solution would be 4.03.
The organic compound aldehyde contains which functional group?
amide
carbonyl
carboxyl
hydroxyl
Answer: Carbonyl is the functional group.
Explanation: Aldehyde is a functional group containing the group -CHO .
Amide is the functional group which contains the group -CONH2.
Carboxyl is the functional group which contains the group -COOH.
And Hydroxyl is the functional group which contains the group -OH.
When dissociated into water, what type of particles do acids release?
The molecule pictured above could be part of which of the following?
Select one: a. Fat b. DNA c. RNA d. Enzyme
Answer:
A
Explanation:
The answer is A, fat because of the hydrogen compounds and the carbon center compounds.
How are monosaccharides different from disaccharides?
List the two main kinds of changes that you can observe when chemical reactions occur.
If a iron bar cost $0.015cm^3 and it's 8.0cm wide and 0.40cm high and 310 cm long how much will it cost to make the iron bar
What is the concentration of 58.5g of nacl in 2l of solution?
What is the density of a liquid that has a volume of 10.0 ml and a mass of 22.00 grams?
To find the density of a liquid with a mass of 22.00 grams and a volume of 10.0 ml, divide the mass by the volume to get a density of 2.20 g/ml.
Explanation:To calculate the density of a liquid, you can use the formula:
Density = mass / volume
In this case, the mass of the liquid is 22.00 grams and the volume is 10.0 ml (which can also be written as 10.0 cm³ as 1 ml is equivalent to 1 cm³). Plugging these values into the formula gives us:
Density = 22.00 g / 10.0 ml = 2.20 g/ml
Therefore, the density of the liquid is 2.20 g/ml.
Why did j. j. thomson reason that electrons must be a part of the atoms of all elements?
I think it’s “cathode rays are negatively-charged particles.”
Explanation:
how is iodine bad for human health?
What kind of compound increases the hydrogen ion concentration in a solution?
An acid.
An acidic compound.
*Acids increase concentrations of H+ ions.
When atoms of two or more elements are chemically bonded the substance formed is a?
When aqueous solutions of __________ are mixed, a precipitate forms. select one:
a. k2so4 and crcl3
b. nai and kbr
c. li2co3 and csi
d. koh and ba(no3)2 incorrect
e. nibr2 and agno3?
When aqueous solutions of [tex]\rm NiBr_2\;and\;AgNO_3[/tex] are mixed, a precipitate form.
A precipitation can occur when two solutions containing different salts are mixed, and a cation/anion pair in the resulting combined solution forms an insoluble salt; this salt then precipitates out of solution.
In the given combination,
[tex]\rm K_2SO_4\;and\;CrCl_3[/tex] : The reaction will result in Group 1A compounds which are soluble.
[tex]\rm NaI\;and\;KBr[/tex] : The reaction will result in Group 1A compounds which are soluble.
[tex]\rm Li_2CO_3\;and\;CSi[/tex] : carbonates with group 1A elements becomes soluble.
[tex]\rm NiBr_2\;and\;AgNO_3[/tex] : The product will be a halide with Ag which are insoluble in water, and thus precipitates out.
When aqueous solutions of [tex]\rm NiBr_2\;and\;AgNO_3[/tex] are mixed, a precipitate form.
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What is the molarity of a 1.50 L solution containing 14 g of HCl
Investigating changes in colligative properties involves the measurement of a solution's concentration in molality instead of molarity because
Explanation:
Molality is defined as the number of moles of solute per kg of solution. That is, molality depends on the mass.
Whereas molarity is defined as the number of moles per liter of solution. That is, molarity depends on the volume of solution.
Also, when there is change in temperature then volume of solution changes but mass does not change.
Thus we can conclude that investigating changes in colligative properties involves the measurement of a solution's concentration in molality instead of molarity because mass does not change whereas volume does change.
The decomposition of methanol, ch3oh(g), to form ch4(g) and o2(g) absorbs 252.8 kj of heat per mole of oxygen formed. write a balanced thermochemical equation for this reaction.
The balanced thermochemical equation for the decomposition of methanol (CH3OH(g)) to form CH4(g) and O2(g) is CH3OH(g) -> CH4(g) + O2(g) + 252.8 kJ/mol of O2 formed.
Explanation:The balanced thermochemical equation for the decomposition of methanol (CH3OH(g)) to form CH4(g) and O2(g) can be written as:
CH3OH(g) -> CH4(g) + O2(g) + 252.8 kJ/mol of O2 formed.
In a neutralization reaction, how many moles of hclo4 react with 1 mole of al(oh)3?
Answer:
3 moles of HClO₄ is required to neutralize 1 mole Al(OH)₃.
Explanation:
The neutralization reaction between HClO₄and Al(OH)₃is as follows:
HClO₄ + Al(OH)₃ -> Al(ClO₄)₃ + H₂O
The balanced reaction is as follows:
3HClO₄ + Al(OH)₃ -> Al(ClO₄)₃ + 3H₂O
Based on the balanced molecular equation the molar ratio of HClO₄ : Al(OH)₃ is 3:1.
So 3 moles of HClO₄ is required to neutralize 1 mole Al(OH)₃.
To sterilize a 50.0-g glass baby bottle, we must raise its temperature from 22.0ºc to 95.0ºc . how much heat transfer is required?
If you wanted to save money on your electric bill all of the following would help except
Which of the following has helped preserve resources while cutting the demand for energy?
A. water treated with chlorine
B. energy efficient appliances
C. landfills rather than burning waste
D. legislation against the use of chlorofluorocarbons
Answer: Option (D) is the correct answer.
Explanation:
When there is minimum use of energy and we are still able to preserve resources then it means we are cutting the demand for energy.
Therefore, when we are treating water with chlorine then it means without any electricity or energy we are cleaning the water. But at the same time chlorinated water is harmful to use unless chlorine is dissolved in limiting quantity.
Whereas energy efficient appliances will use the electricity efficiently.
Landfill will require the use of machines or man power therefore, energy will be used.
On the other hand, when rules are framed against the use of chlorofluorocarbons then there will be lesser depletion of ozone layer. Hence, use of energy will be minimum.
Thus, we can conclude that legislation against the use of chlorofluorocarbons has helped preserve resources while cutting the demand for energy.
Which best describes the function of carbohydrates in the body?
Carbohydrates store excess energy as fat.
Carbohydrates provide the body’s energy and fiber.
Carbohydrates are the building blocks for sterols.
Carbohydrates control substances going into and out of cells.
what is the second most abundant gas in our atmosphere
Answer: Oxygen is the second most abundant gas in our atmosphere. ap
Explanation:
If the substance being oxidized is in direct contact with the substance being reduced, what will be produced?
a. mass
b. heat energy
c. friction energy
d. potential energy
What type of reaction is zinc metal is added to a solution of copper (ii) chloride chemical equation?
Write a balanced nuclear equation for the beta decay of carbon-11.
The balanced nuclear equation for the beta decay of carbon-11 is ⁶₁₁C → ⁶₁₂N + ⁰⁻₁e, which indicates carbon-11 transforming into nitrogen-11 and emitting a beta particle (electron).
Explanation:The beta decay of carbon-11 is a type of radioactive decay where a beta particle (an electron) is emitted from an atomic nucleus. Writing a balanced nuclear equation for this process involves showing the original nucleus, the emitted beta particle, and the resulting daughter nucleus. In beta decay, a neutron in the nucleus is transformed into a proton and an electron. The electron is ejected from the nucleus as the beta particle, and the atomic number of the nucleus increases by one while the mass number remains the same.
The balanced nuclear equation for the beta decay of carbon-11 is:
⁶₁₁C → ⁶₁₂N + ⁰⁻₁e
Here, carbon-11 (⁶₁₁C), with 6 protons and 5 neutrons, decays to nitrogen-11 (⁶₁₂N), which has 7 protons and 4 neutrons, by emitting a beta particle (⁰⁻₁e, also represented as β-). This process increases the atomic number by one, from carbon (6) to nitrogen (7), while the mass number remains 11.
Final answer:
The balanced nuclear equation for the beta decay of carbon-11 is 11C → 11B + β + γ. The daughter isotope in this decay is boron-11 (11B).
Explanation:
The balanced nuclear equation for the beta decay of carbon-11 is:
11C → 11B + β + γ
The daughter isotope in this decay is boron-11 (11B).