# What is the relative formula mass of #(NH_4)_3PO_4#?

##### 1 Answer

#### Explanation:

We're asked to calculate the formula mass of ammonium phosphate,

To calculate the formula mass of **any** compound, we can multiply the relative atomic masses (or *atomic weights* or *atomic masses*) of each of the elements by by how many elements are in the compound, do it for each element, and sum the total.

You may need to refer to a periodic table to find the relative atomic masses of each element; nevertheless, here's how to do it (it's pretty straightforward):

First, let's multiply the atomic mass of nitrogen (

("*molar mass* of that substance in

Let's repeat this process for each of the elements in the compound, and sum the total:

Thus, the formula mass of