Question

question 6 of 25
how is stoichiometry used to calculate energy absorbed when a mass of liquid boils?

a. grams liquid × mol/g × δh_reaction
b. grams liquid × mol/g × δh_vap
c. grams liquid × mol/g × δh_fusion
d. grams liquid × mol/g × δh_f

Explanation:

Step1: Recall heat - of - vaporization concept

When a liquid boils, the energy absorbed is related to the heat of vaporization ($\Delta H_{vap}$).

Step2: Determine the calculation method

To calculate the energy absorbed when a mass of liquid boils, we first convert the mass of the liquid (in grams) to moles by multiplying by the reciprocal of the molar mass (mol/g), and then multiply by the heat of vaporization ($\Delta H_{vap}$). The formula is Grams liquid×mol/g×$\Delta H_{vap}$.

Answer:

B. Grams liquid × mol/g × $\Delta H_{vap}$