Two experimental runs are performed to determine the calorimetric properties of an alcohol that has a melting point of -10°C
In the first run, a 200-g cube of frozen alcohol, at the melting point, is added to 300 g of water at 20°C in a styrofoam container. When thermal equilibrium is reached, the alcohol-water solution is at a temperature of 5.0°C. In the second run, an identical cube of alcohol is added to 500 g of water at 20°C and the temperature at thermal equilibrium is 10°C. The specific heat of water is 4190 J/kg•K. Assume that no heat is exchanged with the styrofoam container and with the surroundings. The heat of fusion of the alcohol is closest to
A) 5.5 × 104 J/kg
B) 7.1 × 104 J/kg
C) 7.9 × 104 J/kg
D) 6.3 × 104 J/kg
E) 8.7 × 104 J/kg
D
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