Answer to Question #99892 in General Chemistry for Beverlie

Question

Gas Y effuses half as fast as O2. What is the molar mass of gas Y? answer in g/mol

Answer 1

According to Graham's law,

(r₁/r₂)²=M₂/M₁

r₁ and r₂ are the rates of effusion and M₁ and M₂ are the molar masses of the two gases. M₁ = 32 g/mol

Then,

(1/2)²= 32/M of y

1/4=32/M y

M y = 32•4 = 128 g/mol

Have a nice day :)