Question

A dry gas measuring 280ml at 305K and 750mm of Hg weighs 0.344g molecular weight of the gas

Answer 1

Hey dear,

● Answer -
M = 31.2 g/mol

● Explaination -
# Given -
V = 280 ml = 280×10^-6 m^3
P = 750 mm Hg = 10^5 Pa
T = 305 K
W = 0.344 g

# Solution -
Using ideal gas equation,
PV = nRT
10^5 × 280×10^-6 = n × 8.314 × 305
n = 28 / (8.314×305)
n = 0.011 moles

Molecular weight can be calculated by -
M = W / n
M = 0.344 / 0.011
M = 31.2 g/mol.

Therefore, molecular weight of the gas is 31.2 g/mol.