Fastest Velocity

Question

Which of the following refrigerants would be travelling at the fastest velocity in a compressor at 25 degrees C and 3 atm?

Options

CCI2F2

C H F3

C H CI3

C3H3F5

CCIF3

Answer 1

If you look at Graham's Law of effusion, you'll see that the velocity of a gas is inversely proportional to the molar mass. This means that the lighter (gas with lowest molar mass) will travel the fastest. Calculate the molar mass of each and find the one with the lowest value.