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# Help Zone

### Student Question

Secondary III • 1yr.

Hello!

In my homework, it requires converting a 77 g / ml concentration into a mass volume percentage, but I don't know how.

Science

## Explanations (1)

• Explanation from Alloprof

Explanation from Alloprof

This Explanation was submitted by a member of the Alloprof team.

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Team Alloprof • 1yr.

Hi!

When we want to know the concentration of a solution in mass volume percentage (% m / v), we first want to put the concentration on a denominator of 100 ml. It will then be necessary to determine the quantity of solute in this volume.

Here is one way to solve this problem:

$$\frac{77 \;g}{1 \;ml}=\frac{x}{100 \; ml}\Rightarrow x = \frac{77 \;g \times 100 \; ml}{1 ml \;}$$

$$x = 7700 g$$

The concentration is therefore 7,700% m / v.

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