Partial pressure In a mixture of gases, each constituent gas has a partial pressure, which is the notional pressure of that constituent gas, if it alone occupied the entire volume of the original mixture at the same temperature. Dalton's law Total pressure of an ideal gas mixture is the sum of the partial pressure of the gases in the mixture. Partial pressure due to n1=(p1∘=‌
n1RT
V
) Similarly, due to n2=(p2∘=‌
n2RT
V
) Total pressure p=p1∘+p2∘=‌
(n1+n2)RT
V
Given, total volume =24.6L Moles of H2=1.5mol Moles of N2=2.5mol Temperature =300K Partial pressure of N2= ? Partial pressure of N2=‌
‌ Moles of ‌N2×RT
V
=‌
2.5‌ moles ‌×8.314×103LPaK−1mol−1×300K
24.6L
=253475.61 Pa (convert into atm) (1atm=101325Pa) =2.5atm(2.50160)