Is there an equation used to fond remaining pressure

Question

When CS2 at partial pressure 1930 torr reacts with H2 at partial pressure 8650 torr at constant volume and constant temperature according to the balanced equation, determine the partial pressure (atm) of H2 that remains.

CS2(g) + 4H2(g) → CH4(g) + 2H2S(g)

Answer 1

Not one of which I'm aware. What you must do is calculate the moles CS2 used and the moles H2 used and subtract from the initial amounts. From the wording in the problem, I think CS2 is the limiting reagent.