A mixture of gases contains 0.4 mole of N2, 0.5 moles of O2, and 0.7 moles of H2. What is the total

Question

pressure if partial pressure of O2 is 1.3 atm?

Answer 1

Determine mole fraction, X, of O2.
XO2 = mols O2/total mols.
Then XO2*Ptotal = PO2.
Solve for Ptotal.