# What is the mass percent of a solution that contains 45.6 grams ethanol (#C_2H_6O#) in 254 grams of water?

##### 1 Answer

Jul 7, 2015

The solution is **15.2% m/m**.

#### Explanation:

The *mass percent* of a solution is simply the ratio between the mass of the solute, in your case ethanol, and the mass of the **entire solution**, which contains ethanol and water.

This is what's known as the percent concentration by mass, or **%m/m**.

So, the mass of the solution will be

This means that the mass percent of the solution is