# Question #80bdd

Feb 18, 2016

If you mean Ca and the charge on it 2+, then look at this, you only need the Ca here okay? forget the 2+, charge doesn't matter, subscripts and coefficients do
And as for your question, its very simple
The number of moles = $M a s s / M o l a r M a s s$
But you havent given enough information, I need a given mass