# How do you determine the number of moles argon in 452 g of argon?

$\text{Number of moles}$ $=$ $\text{Mass"/"Molar mass}$.
And the $\text{number of moles of argon gas}$ is thus:
(452*cancelg)/(39.95*cancelg*mol^-1)= ??*mol. Why do I get an answer with units of $m o l$?