The pressure of a 1:4 mixture of dihydrogen and dioxygen enclosed in a vessel is one atmosphere. What would be the partial pressure of dioxygen?

MOLE FRACTION=

Let the moles of dihydrogen=1 and dioxygen=4

Mole fraction of O₂=

=

Partial pressure= mole fraction Х Total pressure

= ×1

= 0.8atm

= 0.8×10⁵Nm^-2

= 8×10⁴Nm^-2