If a 17.90-g sample of a gas occupies 10.0 L at STP,what is the molar mass of the gas at 125°C?
A)5.48 g/mol
B)40.1 g/mol
C)18.4 g/mol
D)58.5 g/mol
E)Not enough information is given.

Question

Quizplus · Accepted Answer

The molar mass of a gas does not change with temperature. At STP (Standard Temperature and Pressure), 1 mole of any gas occupies 22.4 L. Given a 10.0 L volume, the amount of gas is $ \frac{10.0 L}{22.4 L/mol} = 0.4464 $ moles. The molar mass is then calculated as $ \frac{17.90 g}{0.4464 mol} = 40.1 g/mol $.

If a 1790-G Sample of a Gas Occupies 10