Chapter 11, Problem 11PS

Interpretation Introduction

Interpretation: The energy required to evaporate $\text{125mL}$of alcohol has to be determined.

Concept Introduction:

The energy required to overcome the intermolecular forces of attraction for 1mol of a substance is called standard enthalpy of vaporization,${\text{Δ}}_{\text{vap}}{\text{H}}^{\text{0}}$

Equation for density is,

  $\text{Density}\text{=}\frac{\text{Mass}}{\text{Volume}}$

From given mass is the number of moles are calculated as follows,

  $\text{Number of moles}\text{=}\frac{\text{Given}\text{mass}}{\text{Molecular}\text{mass}}$