If 0.250 g of a gas sample represents 1.05x10–2 mol, what is the molar mass of the gas?

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Answer 1 · 2017-10-11T00:57:28

#23.80" g/mol"#

#(0.250" g")/(1.05xx10^-2" mol") = 23.80" g/mol"#

Answer 2 · 2017-10-11T00:59:29

The molar mass would be 23.81 g/mol

You can set this solution up by keeping track of the units.
Molar mass is always expressed as grams per mole (g #-:# moles)

Our numbers are 0.250 g and #1.05xx10^(-2)# mol.

If we divide the first value by the second, the answer will necessarily have units of grams per mole, and so, will be the molar mass:

#(0.250 g) / (1.05xx10^(-2) "mol") = 23.81# g/mol