Question

Which gas diffuses faster ammonia or carbon dioxide?

Answer 1

the heavier the gas is(in terms of its molecular weight), the slower it is.

Having this in mind, we can look at the diffusion rate  of the two gases bylooking at their molecular weights.(note that diffusion process is slower than effusion but the same law can apply for both)

Molecular weight of ammonia NH4= 14+(1x4)= 18

Molecular weight of CO2 = 12 +(32x2) =76

Hence, ammonia is lighter and from Grahams law of effusion, it then means that it will diffuse faster than CO2, which is heavier.

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Answer 2

carbon dioxide diffuses faster