CH4 diffuses twice as fast as Y.Molecular weight of Y is :

a. 16 b. 32 c. 48 d. 64

twice as fast? 2x.

so what is the molmass of CH4 x (2)^2 ?

64

64

To answer this question, we need to understand the concept of diffusion and how it relates to molecular weight.

Diffusion is the process by which particles move from an area of higher concentration to an area of lower concentration. In general, smaller and lighter molecules tend to diffuse faster than larger and heavier molecules.

The given information states that CH4 (methane) diffuses twice as fast as Y. This means that the molecular weight of Y is twice that of CH4.

Now, we need to determine the molecular weight of CH4, which consists of one carbon (C) atom and four hydrogen (H) atoms. To find the molecular weight, we can add the atomic masses of one carbon atom and four hydrogen atoms.

The atomic mass of carbon is approximately 12 atomic mass units (amu), and the atomic mass of hydrogen is approximately 1 amu. Therefore, the molecular weight of CH4 is:

(1 × 12 amu) + (4 × 1 amu) = 12 amu + 4 amu = 16 amu.

Since Y has twice the molecular weight of CH4, the molecular weight of Y is:

16 amu × 2 = 32 amu.

Therefore, the correct answer is (b) 32.