The term *proof* is defined as twice the percent by volume of pure ethanol in solution. Thus, a solution that is 95% (by volume) ethanol is 190 proof. What is the molarity of ethanol in a 92 proof ethanol–water solution? Assume the density of ethanol, C_{2}H_{5}OH, is 0.79 g/cm^{3} and the density of water is 1.0 g/cm^{3}.

First, let us establish that **ethanol will be referred to as EtOH** throughout the calculations as shorthand.

Now the relationship of proof to %volume can be expressed by the equation below: