What is the ratio of the average rate of effusion of NOF(g)

Last updated: 8/4/2022

What is the ratio of the average rate of effusion of NOF(g) to that of HBr(g) at 400 K? YOU MUST WRITE THE CALCULATION FOR FULL CREDIT 81:49 The average rate of effusion is the same for the two gases. 7:9 9:7 49:81