We were given **% m/v **so, in order to get a **mass value for ethanol**, we need to **assume the volume of solution**. We have to take note that we can assume the volume of the solution because we are looking for concentration values. We also have to keep in mind that the assumed volume should be consistent across all calculations.

A bottle of wine contains 12.5% ethanol by volume. The density of ethanol (C_{2}H_{5}OH) is 0.789 g/cm^{3}. Calculate the concentration of ethanol in wine in terms of mass percent and molality.

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