A sample of natural gas contains 7.546 moles of CH4, 0.775 moles of C2H6, and 0.444 moles of C3H8. If the total pressure of the gases is 4.03 atm, what are the partial pressures of the gases?

Answer 1

Add up moles of each to get total moles.

Find mole fraction of each gas by dividing moles of each by total

Multiply mole fraction of each by 4.03 atm to obtain partial pressure of each.

See Daltons Law of Partial Pressure