Question

What is the molar mass of a gas if 1.25 g of the gas has a volume of 255 L at STP?

Answer 1

Answer: 0.11g/mol

Explanation: 1mole of any gas contains 22.4L at stp.

Xmol of the gas will contain 255L i.e

Xmol of the gas = 255/22.4 = 11.38moles

recall

n = Mass conc. / molar Mass

Molar Mass = Mass conc. / n

Molar Mass = 1.25/11.38 = 0.11g/mol