Question

1. What is the molar mass of He? Please round to the nearest hundredths.

2. What is the molar mass of CH4? Please round to the nearest hundredths.

3. what is the ratio of the effusion rate of helium to methane? please round to the nearest hundredths.

Answer 1

1. 4.00g / mol is the molar mass of helium

2. 16.04 g/mol

3. Grahams law:

Rate of diffusion or effusion of a gas at given conditions inversely proportional to the root of molecular mass & gas.

r1​/r2​=M2​/M1​

​

rCH4​​rHe​​=MHe​MCH4​​​

​=416​

​=2