# Grams/Moles Calculations?

## Find the number of moles. 16g of ${H}_{3} P {O}_{4}$ What do i do? I found the mass of the compound, which is 97.994 What do i do next?

Apr 4, 2018

$\text{0.163 mol}$

#### Explanation:

$\text{97.994 g/mol}$ is the molar mass of ${\text{H"_3"PO}}_{4}$. It is mass of $\text{1 mol}$ of ${\text{H"_3"PO}}_{4}$.

$\text{1 mol H"_3"PO"_4 = "97.994 g}$

1 = ("1 mol H"_3"PO"_4) / "97.994 g"

Multiplying a number with color(red)(("1 mol H"_3"PO"_4) / "97.994 g") is equivalent to multiplying it with $1$.

So,

${\text{16 g H"_3"PO"_4 = 16 cancel("g H"_3"PO"_4) xx ("1 mol H"_3"PO"_4)/(97.994 cancel("g H"_3"PO"_4)) = "0.163 mol H"_3"PO}}_{4}$