Question

0.15 g of a gas occupies a volume of 49.95 ml at 750 mm pressure and 25° C temperature. Find out the vapour density and molecular mass of the gas.​

Answer 1

Answer:74.45 37.22

Explanation:

PV=nRT

PV=w/M ×RT

molar mass= given weight×RT/PV

= 0.15× 0.0821×298×1000×760/750×49.95

=74.45g/mol

Molar mass=2×vapour density

VD= 74.45/2=37.22

Convert ml into litres by dividing with 1000 and mm of hg into atm by dividing 750 with 760

Hope this helps you