What is the percentage composition of chlorine by mass in calcium chloride?

Sep 15, 2017

Well the molar mass of calcium chloride is $110.98 \cdot g \cdot m o {l}^{-} 1$.....

Explanation:

And the molar masses of the molar masses of elemental calcium and chlorine are $40.10 \cdot g \cdot m o {l}^{-} 1$ and $35.45 \cdot g \cdot m o {l}^{-} 1$ respectively.....

And so we take the quotient.....

%Cl=(2xx35.45*g*mol^-1)/(110.98*g*mol^-1)xx100%~=65%

What is %Ca?