Calculate the Amount of Heat Energy, in Units of Kilojoules

question 39

Multiple Choice

Calculate the amount of heat energy, in units of kilojoules, required to convert 50.0 g of liquid ethanol, CH₃CH₂OH, at 25.5°C to gaseous ethanol at 92.0°C. (C_{ethanol liquid} = 2.44 J/g°C; C_{ethanol gas} = 1.42 J/g°C; molar heat of vaporization of liquid ethanol = 3.86 × 10⁴ J/mol. The boiling point of ethanol is 78.4°C and its molar mass is 46.07 g/mol.)

• A)49.2 kJ
• B)1.93 × 10³ kJ
• C)0.862 kJ
• D)1.35 × 10² kJ
• E)2.67 kJ

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