2.15 g of an unknown gas at 71 degrees C and 1.10 atm is stored in a 1.75 L flask. Solve for the density and the molar mass of the gas.

For this we use the ideal gas equation for the calculations. It is expressed as:

PV = nRT

Density = m/V

Density = 2.15 g / 1750 mL = 0.00123 g/mL

Since,

PV = nRT

P = nRT/V

P = density RT / Molar mass

Thus,

Molar mass = densityRT / P

Molar Mass = (1.23) (0.08206) (71+273.15) / 1.10 = 31.58 g/mol