Question

When r, P and M represent rate of diffusion, pressure and molecular mass, respectively, then the ratio of the rates of diffusion $(r_A/r_B)$ of two gases A and B, is given as:

• A. $(P_A/P_B) (M_B/M_A)^{1/2}$
• B. $(P_A/P_B)^{1/2} (M_B/M_A)$
• C. $(P_A/P_B) (M_A/M_B)^{1/2}$
• D. $(P_A/P_B)^{1/2} (M_A/M_B)$

Answer 1

Answer: (A)

$(P_A/P_B) (M_B/M_A)^{1/2}$

Answer 2

$r \propto \frac{P}{\sqrt{M}}$ $\frac{r_{A}}{r_{B}}= \frac{P_{A}}{P_{B}} \sqrt{\frac{M_{B}}{M_{A}}}$