# How many grams of sodium do you need to produce 18g of sodium chloride?

Mar 1, 2018

$\text{7.1 g}$

#### Explanation:

Chemical formula of sodium chloride is $N a C l$
Molar mass $: 58.5 g$
Molar mass of sodium $: 23 g$
Molar mass of chlorine $: 35.5 g$

Mass of $N a C l$ we have is $18 g$
Recall $n = \frac{m}{M}$ (where n is number of moles, m is given mass, M is molar mass)

$n = \frac{18}{58.5}$

Now using this for sodium

$\frac{18}{58.5} = \frac{m}{23}$

$m = \text{7.1 g}$