. In an experiment in a general chemistry laboratory, a student collected a sample of a gas over water. The volume of the gas was 265 mL at a pressure of 753 torr and a temperature of 27 °C. The mass of the gas was 0.472 g. What was the molar mass of the gas?

Molar mass of the gas = 44 g / mole

Explanation:

Given that

Volume of the gas (V) = 265 x 10⁻³ lit

Temperature (T) = 300 K

Pressure of gas (P) = atm

Mass of the gas = 0.472 g

Molar mass of the gas = ?

Using ideal gas equation

PV = nRT

where R = universal gas constant = 0.0821 lit. atm. mole⁻¹. k⁻¹

⇒   x 265 x 10⁻³ lit = x 0.0821 x 300

⇒ Molar mass = = 44 g/mole

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