# What is the molar mass of copper(l) nitrate, Cu(NO_3)_2?

Jul 11, 2016

The molar mass of $C u N {O}_{3}$ is 125.55 g/mol

#### Explanation:

Based on the formula you've given me, that compound would actually be copper (II) nitrate. Copper (I) nitrate is $C u N {O}_{3}$

Before we begin here's a tip:

atomic weight of element $\times$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 Cu, N, O

Cu has an atomic weight of 63.55 g/mol
N has an atomic weight of 14.01 g/mol
O has an atomic wight of 16.00 g/mol

Based on the chemical formula, we have 1 atom of Cu, which would have an atomic weight of 63.55 g/mol

Next, we have 1 atoms of N, and that has an atomic mass of 14.01 g/mol

You have 3 atoms of O so we would multiply the atomic mass of O by 3 to obtain 48.00 g/mol.

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

63.55 g/mol + 14.01 g/mol + 48.00 g/mol = 125.55 g/mol