# What is calcium nitrate's atomic mass?

Feb 6, 2017

The formula mass of $C a {\left(N {O}_{3}\right)}_{2}$ is $164.09 \cdot g \cdot m o {l}^{-} 1$.

#### Explanation:

So how did we get that mass?

Well, in each formula units of $\text{calcium nitrate}$ there is one atom of calcium, 2 atoms of nitrogen, and 6 atoms of oxygen. If I take the atomic masses (from where?) and sum them appropriately:

$\text{Formula mass of calcium nitrate}$

$= \left(40.1 + 2 \times 14.01 + 6 \times 15.999\right) \cdot g \cdot m o {l}^{-} 1$

=??*g*mol^-1. Sum them up and waddya get?

Do you have to remember these numbers?