The molar masses of four unknown gases are shown in the table. Molar Mass of Unknown GasesGas Molar Mass A 44 g/mol
B 20 g/mol
C 30 g/mol
D 32 g/mol
Which gas is likely to have the highest rate of effusion?

Gas B

Explanation:

diffusion/effusion increases when:

-Temperature increases

-A gas has lower molar mass

-Particles are moving quickly

diffusion/effusion decreases when:

-Temperature decreases

-A gas has higher molar mass

-Particles are moving slowly

Hence: since gas B has the lowest molar mass, it has the highest rate of effusion

I also took the test so I know it is right

the answer for sodium is 0.186

the answer for rubidium is 0.251