A sample of liquid butan-1-ol, C4H7OH was brought to the boil in an open calorimeter. An electric current of 289 mA from a 12.0 V source was then passed through a resistive heater coil which was immersed in the liquid. The current was allowed to flow for a period of 245 s, during which time the temperature remained constant and 1.416 g of butan-1-ol was found to have evaporated. Calculate the molar enthalpy of vaporization of butan-1-ol.
A) 86.8 kJ mol-1
B) 850 J mol-1
C) 16.7 kJ mol-1
D) 43.3 kJ mol-1
Correct Answer:
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