# How do you calculate the percent composition of all the elements in Ca(NO_3)_2?

Mar 15, 2018

Well, take the weighted mass of each element as a percentage of the molecular mass....

#### Explanation:

And calcium nitrate has a molar mass of $164.09 \cdot g \cdot m o {l}^{-} 1$..

...and thus %Ca=(40.1*g)/(164.09*g*mol^-1)xx100%=24.4%

...and %N=(2xx14.01*g)/(164.09*g*mol^-1)xx100%=17.1%

...and %O=(6xx16.00*g)/(164.09*g*mol^-1)xx100%=58.5%

Do the percentages add up to 100%? Should they do so?