Chemistry - Gas Stoichiometry

Question

How much faster would He gas effuse than Ne? (record your answer to 2 decimal places)

Answer 1

Again, read up on Graham's law of effusion.

rate of gas 1 / rate gas 2 = sqrt MW gas 2 / sqrt MW gas 1

Let He be gas 1; MW = 4.00 g / mol

Let Ne be gas 2: MW = 20.18

For He, √4 = 2.00

For Ne, √20.18 = 4.49

Since He is lighter it will effuse faster than Ne.

How much faster? 4.49 / 2.00 = 2.25 times faster