Problem: Place the following gases in order of decreasing average molecular speed at 28 oC: Ne, HBr, SO2, NF3, CO.

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We are asked to place the following gases in order of decreasing the average molecular speed at 28 oC: Ne, HBr, SO2, NF3, CO.


The higher the molar mass, the lower the speed of the molecule. 

Molar mass Ne = 20.18 g/mol

Molar mass HBr = 80.91 g/mol

Molar mass SO2 = 64.07 g/mol

Molar mass NF3 = 71.01 g/mol

Molar mass CO = 28.01 g/mol


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Problem Details

Place the following gases in order of decreasing average molecular speed at 28 oC: Ne, HBr, SO2, NF3, CO.

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Kinetic Molecular Theory concept. You can view video lessons to learn Kinetic Molecular Theory. Or if you need more Kinetic Molecular Theory practice, you can also practice Kinetic Molecular Theory practice problems.