2 moles of helium (He) are pumped from a gas canister into a weather balloon. The balloon at this point has a volume V1.

Question

1 mole of nitrogen gas (N2) is added at the same temperature and pressure. The volume of the balloon changes to V2.

How will the new volume of the balloon compare with the old volume (V1)?
1) 2 × V1
2) 0.50 × V1
3) None of these
4) There will be no change in volume.
5) 1.5 × V1
6) 0.67 × V1

Answer 1

Won't it be V1*(3/2)?
P1V1 = n1RT but P, R and T are constants so V1 = kN1 and V2 = kN2
(V1/V2) = (n1/n2)