If gas A has a molar mass of 32 g/mol and gas B has a...

JAMB 2023

If gas A has a molar mass of 32 g/mol and gas B has a molar mass of 64 g/mol, what is the ratio of their diffusion rates?

A. 2:1
B. 1:2
C. 1:1
D. 1:4

NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789

Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts

Correct Answer: Option A

Explanation

According to Graham's law of diffusion, the ratio of the diffusion rates of two gases is the inverse of the square root of the ratio of their molar masses. Therefore:

Rate of A / Rate of B = √(Molar mass of B / Molar mass of A)
Rate of A / Rate of B = √(64 g/mol / 32 g/mol) = √2 = 1.41

So, the ratio of their diffusion rates is approximately 2:1.

There is an explanation video available below.

Previous Next

Go back to Chem classroom

Report an Error Ask A Question Download App