My question is, that it's asking us to tell whether the partial pressure of a molecule will increase decrease of remain the same and to show it by a calculation? I don't which calculation to use. I have V T P and grams. I don't know what equation to use to show my prediction.
Assuming it is an Ideal gas, You are going to make Pressure here the subject of formula and input it into Dalton's law of Partial pressure. Ptotal = P1 + P2 + P3 ............