# A sample of hydrogen gas has a volume of 8.22 L at a temperature of 22°C and a pressure of 3.5 atm.?

Calculate the grams of hydrogen gas present in this gas sample. AnswerIncorrect

g

• Let’s use the following equation to determine the number of moles of hydrogen gas.

P * V = n * R * T

T = 273 + 22 = 295

3.5 * 8.22 = n * (22.4/273) * 295

n = 7854.21÷ 6608

This is approximately 1.2 moles. The mass of one mole of hydrogen gas is 2 grams.

Mass = 2 * (7854.21÷ 6608)

This is approximately 2.38 grams.

• pV = nRT

n = PV/RT = 1.188 moles

so

m(H2) = 2.4 g

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