Question

22.4 litres of a gas weighs 70 g at S.T.P. Calculate the weight of the gas if it occupies a volume of 20 litres at 27°C and 700 mm Hg of pressure.​

Answer 1

Explanation:

● STEP: 1

V1=20 litres

P1=700 mm

T1=300 K

V2=22.4 litres

T2=273K

P2=760 mm

By gas equation,

P1V1 / T1 = P2V2 / T2

700 × 20/300 = 760 × V2/273

V2 = 791×7/76 = 637/38 = 16.76

● STEP: 2

22.4 litres of the gas at STP weight =70g

16.76 litres of the gas has weight at 

STP = 70×16.76 / 22.4 = 52.38g

ans: 52.38g