Question

what is the ultimate goal of measuring the pressure of ethanol vapor at different temperatures? select one: to determine the boiling point of ethanol. to find the universal gas constant, r. to calculate the heat of vaporization (δh_vap) of ethanol. to prove that ethanol is a volatile liquid.

Explanation:

By measuring the pressure of ethanol vapor at different temperatures and using the Clausius - Clapeyron equation ($\ln P=-\frac{\Delta H_{vap}}{R}\cdot\frac{1}{T}+C$), where $P$ is vapor pressure, $T$ is temperature, $\Delta H_{vap}$ is heat of vaporization, $R$ is the universal gas constant and $C$ is a constant, one can calculate the heat of vaporization of ethanol. Determining boiling - point usually requires more than just vapor - pressure temperature data, finding the universal gas constant is not the main goal here, and the volatility is already known and not the ultimate goal of this measurement.

Answer:

To calculate the heat of vaporization ($\Delta H_{vap}$) of ethanol.