# Question #d2834

##### 1 Answer

#### Answer:

Percent of **24.17%**.

Percent of **75.83%**.

#### Explanation:

You know that your **29.96 g** of sodium by mass. This means that, for every *100 g* of mixture, you get **29.96 g** of sodium.

So, let's assume that you have **100 g** of mixture. The first relationship you can write is

In order to find a relationship between the total mass of sodium in the mixture and the mass of sodium each compound contributes to the this valu,e you can use sodium's percent composition by mass in

To do that, use the molar mass of sodium and the molar mass of each compound

and

Since you know that your **100-g** sample contains **29.96 g** of sodium, you can use *mass of* *mass of*

Since

Since the sample has a mass of **100 g**, the mass each compound has also represents its *percent by mass* in the compound

and