Question

A sample of an unknown gas has a mass of 0.116 g. It occupies a volume of 25.0 mL at a temperature of 127°C and has a pressure of 155.3 kPa. Calculate the molar mass of the gas.

Answer 1

Answer:

The molar mass of the gas is 99.4 g/mol

Explanation:

Ideal gas law PV=nRT. P=155.3 T=127+273= 400K V=25.0 Gas constant=8.314 Now substiture the values into the equation n=PV/RT

n= (155.5kPa x 25.0mL x 1l/1000mL)/ 8.312l*KPa/mol*K x 400K

n= 0.001167 mol

Molar mass= Mass/ Number of moles

                = 0.116g /0.001167 mol

                = 99.4 g/mol