Question

a chemical engineer needs to calculate the amount of coolant required to cool a reaction vessel to a specific temperature. the coolant reduces the temperature of the vessel by absorbing heat from it. during this process, the coolant evaporates. which constant should the engineer use to determine how much coolant is required? $delta h_{fus}$, $delta h_{vap}$, $-delta h_{vap}$, $delta h_{cond}$

Explanation:

Step1: Identify the process

The coolant absorbs heat and evaporates. The heat - of - vaporization ($\Delta H_{vap}$) is the amount of heat required to convert a given amount of a substance from the liquid to the gas phase at constant temperature and pressure.

Step2: Select the relevant constant

To calculate the amount of coolant required to absorb a certain amount of heat (to cool the reaction vessel), we use the heat of vaporization of the coolant. The heat absorbed by the coolant during evaporation is related to its heat of vaporization.

Answer:

$\Delta H_{vap}$