How many moles of $CO_2$ gas are contained in a flask holding 55.0 g of gas?

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Answer 1 · 2017-01-05T10:01:16

$"Number of moles"$ $=$ $"Mass of gas"/"Molar mass of gas"$

$"Number of moles"$ $=$ $(55.0*cancelg)/(44.01*cancelg*mol^-1)=1.25*mol$

Note that our mathematical expression was consistent dimensionally, the $g$ cancelled out, and $1/(mol^-1)=1/(1/(mol))=mol$ as required.

How many moles of CO_2CO_2 gas are contained in a flask holding 55.0 g of gas?