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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