# What is the molar mass of #NH_3#?

##### 1 Answer

Jul 17, 2016

#### Explanation:

**atomic weight of element #xx#number of atoms given by subscript #=# molar mass**

First, you want to have your handy dandy periodic table available so you can determine the atomic weight of N and H:

- N has an atomic weight of 14.01 g/mol
- H has an atomic wight of 1.008 g/mol

From the chemical formula, we have 1 nitrogen atom, so the atomic mass would just be 14.01 g/mol

Next, you have 3 hydrogen atoms, so you would multiply the atomic mass of H by 3 to obtain an atomic weight of 3.024 g/mol

Now you want to add the mass of each atom together to obtain the molar mass of the entire compound: