A Styrofoam coffee cup contains 125 g of hot coffee at 95.0 oC. A 25.0-g ice cube at -20.0 oC is dropped into the hot coffee. After the ice melts and thermal equilibrium is reached, the resulting liquid has a temperature of 65.0 oC. The specific heat capacity of ice is 1.99 J g-1 oC-1 and that of water is 4.184 J g-1 oC-1. The heat capacity of the coffee cup is 15.0 J oC-1. Calculate the molar heat of fusion for water. Assume the coffee is essentially pure water (FW 18.015) and that no heat enters or escapes from the system.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
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A Styrofoam coffee cup contains 125 g of hot coffee at 95.0 oC. A 25.0-g ice cube at -20.0 oC is dropped into the hot coffee. After the ice melts and thermal equilibrium is reached, the resulting liquid has a temperature of 65.0 oC.

The specific heat capacity of ice is 1.99 J g-1 oC-1 and that of water is 4.184 J g-1 oC-1. The heat capacity of the coffee cup is 15.0 J oC-1.

Calculate the molar heat of fusion for water. Assume the coffee is essentially pure water (FW 18.015) and that no heat enters or escapes from the system.

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