Question

A sample of gaseous substance weighing 0.5g occupies a volume of 1.12 litres under NTP conditions. Calculate the molar mass of the substance. ​

Answer 1

Answer:

10.7 g

Explanation:

NTP - Normal Temperature and Pressure - is defined as air at 20 C (293.15 K) and 1 atm.

Gas constant is the value is 0.0821 L.atm.K^-1.mol^-1

applying PV=nRT

n=mass of substance/molecular mass of substance

n=0.5g / molecular mass of gas

Putting values in equation

1*1.12=0.5g / molecular mass of gas*0.0821 L.atm.K^-1.mol^-1*293.15

Molecular mass=$\frac{0.5*0.0821*293.15}{1*1.12}$

=10.7 g