Question

The density of a mixture of oxygen and nitrogen at ntp is 1.3 gram per litre calculate partial pressure of oxygen

Answer 1

Moles of O2 for 8 g of O2 = 8/32 = 1/4

Moles of N2 for 7 g of N2 = 7/28 = 1/4

Total moles = 1/4 + 1/4 = 1/2

Mole percentage of O2 = {(1/4) / (1/2)}*100 = 50%