Answer:
1:25
Step-by-step explanation:
Rate of Diffusion & Molar Mass
We're given:
- gas P diffuses 5 times faster than gas Q
Let
be the rate of diffusion of gas P, and let
be the rate of diffusion of gas Q.

Rate of diffusion is inversely proportional to molar mass:

Thus, the ratio of molecular mass of P to Q is 1:25.