When calcium metal is placed in water, hydrogen gas is produced. Determine the mass of H2 produced at 25 C and 0.967 atm when 525 mL of the gas is collected over water. Consider vapour pressure of water be 0.0313 atm.

Answers

Answer 1

The mass of hydrogen gas produced, given that 525 mL of the gas was collected over water is 0.04 grams

How do i determine the mass of hydrogen gas produced?

First, we shall determine the mole of the dry hydrogen gas collected. Details below:

Vapour pressure = 0.0313 atmPressure of wet gas = 0.967 atmPressure of dry gas (P) = 0.967 - 0.0313 = 0.9357 atmTemperature (T) = 25 °C = 25 + 273 = 298 KVolume of gas (V) = 525 mL = 525 / 1000 = 0.525 LGas constant (R) = 0.0821 atm.L/mol KNumber of mole (n) =?

PV = nRT

0.9357 × 0.525 = n × 0.0821 × 298

Divide both sides by (0.0821 × 298)

n = (0.9357 × 0.525) / (0.0821 × 298)

n = 0.02 mole

Finally, we shall determine the mass of the hydrogen gas produced. Details below:

Molar mass of hydrogen gas, H₂ = 2 g/mol Mole of hydrogen gas, H₂ = 0.02 moleMass of hydrogen gas, H₂ = ?

Mole = mass / molar mass

0.02 = Mass of H₂ / 2

Cross multiply

Mass of H₂ = 0.02 × 2

Mass of hydrogen gas, H₂ = 0.04 grams

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Related Questions

A 1.5 M solution of HCl has 145 g of HCl dissolved, what is the volume of the solution?

Answers

The volume of the 1.5M solution of HCl solution that has 145g of mass is 2.65L.

How to calculate volume?

The volume of a solution can be calculated by dividing the number of moles by its molar concentration as follows;

Volume = no of moles ÷ molarity

According to this question, a 1.5M solution of HCl has 145g of mass. The number of moles can be calculated as follows:

no of moles = 145g ÷ 36.5g/mol = 3.973 moles

volume of HCl solution = 3.973mol ÷ 1.5M

volume of HCl = 2.65L

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If an aqueous solution is 5.321m, which of the following statements is incorrect?
A) Freezing point of solution will lower by 10 C
B) Boiling point of solution will increase by 2.72 C
C) Boiling point of solution will be 100 C
D) Osmotic pressure of solution will be higher than water

Answers

Boiling point of solution will be 100 C. The incorrect statement is C)

What is aqueous solution ?

An aqueous solution is one in which water serves as the solvent. One or more substances are dissolved in water to create such a solution, and the water molecules surround and separate the individual solute particles to create a homogeneous mixture.

Therefore, A solvent's boiling point and freezing point change when a solute is dissolved in it, respectively. Boiling point elevation and freezing point depression are two terms used to describe this occurrence. The concentration of the solute determines how much of an impact it has.

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