Heat, q , is energy transferred between a system and its surroundings. For a pro

Question

Heat, q, is energy transferred between a system and its surroundings. For a process that involves a temperature change

q=m?Cs??T

where Cs is specific heat and m is mass.

Heat can also be transferred at a constant temperature when there is a change in state. For a process that involves a phase change

q=n??H

where, n is the number of moles and ?H is the enthalpy of fusion, vaporization, or sublimation.

The following table provides the specific heat and enthalpy changes for water and ice.

Part A

Calculate the enthalpy change, ?H, for the process in which 31.6g of water is converted from liquid at 16.0?C to vapor at 25.0?C .

For water, ?Hvap = 44.0kJ/mol at 25.0?C and Cs = 4.18 J/(g??C) for H2O(l).

Part B

How many grams of ice at -10.3?C can be completely converted to liquid at 18.9?C if the available heat for this process is 4.29

Explanation / Answer

Part A

Number of moles of water (n) = 31.6

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