Calculate the Amount of Heat Energy, in Units of Kilojoules

question 42

Multiple Choice

Calculate the amount of heat energy, in units of kilojoules, required to evaporate 35.0 g of ethanol, CH₃CH₂OH, at 78.4ºC, ethanol's boiling point. (The molar heat of vaporization of liquid ethanol is 3.86 × 10⁴ J/mol. The molar mass of ethanol is 46.07 g/mol.)

• A)29.3 kJ
• B)1.35 × 10³ kJ
• C)1.10 × 10³ kJ
• D)8.38 × 10² kJ
• E)9.21 × 10⁻⁴ kJ