# How would you calculate the number moles of calcium in 27.0 g of Ca?

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#27.0 g Ca x (1 mol Ca)/(6.022 x 10^23 Ca) = ?#

##### 1 Answer

Aug 19, 2017

Simply divide thru by the molar mass.........and multiply by

#### Explanation:

We KNOW that

And thus we can use this mass as a measure of the NUMBER of calcium atoms we possess.......i.e.

And we get the answer as a DIMENSIONLESS NUMBER as required.