Rank the following gases in order of decreasing rate of effusion.

Rank from the highest to lowest effusion rate. To rank items as equivalent, overlap them.F2 He C5H10 H2 PH3.

Answer:- Here is the rank of the following gases in order of decreasing rate of effusion, from highest to lowest:

• H2
• He
• F2
• PH3
• C5H10

The rate of effusion of a gas is inversely proportional to the square root of its molar mass. So, the gas with the lowest molar mass will have the highest rate of effusion, and the gas with the highest molar mass will have the lowest rate of effusion.

In this case, the gas with the lowest molar mass is H2, followed by He, F2, PH3, and C5H10. Therefore, the rank of the gases in order of decreasing rate of effusion is:

• H2
• He
• F2
• PH3
• C5H10