
Interpretation:
The amount of heat energy needed to convert 866g of ice at –15°C to steam at
Concept introduction:
The amount of heatthatis required to raise the temperature having specific heat is calculated by the expression given below:
Here,
The change in temperature is the temperature difference between the final and initial temperatures. It is expressed as follows:
The amount of energy needed for phase change from liquid phase to vaporphase is given by the relation as follows:
Here,
The amount of energy needed for phase change from solid phase to liquid phase is given by the relation as follows:
Here,

Answer to Problem 85QP
Solution:
Explanation of Solution
Given information: Specific heat of ice is
Step
The energy required to warm ice from –15°Cto
Calculate the change in temperatureby using the equation as follows:
By substituting values in the above equation as follows:
The specific heat
Substitute the required values in the above equation as follows:
Step
The number of moles of water is calculated by dividing the given mass to the molar mass as follows:
Substitute
Step
Calculate the change in temperatureby using the equation as follows:
By substituting the values in the above equation as follows:
The specific heat of water is
Substitute the required values in the equation as follows:
Step
Substitute
Step
Calculate the change in temperatureby using the equation as follows:
By substituting the values in the above equation as follows:
The specific heat of steam is
Substitute the required values in the equation as follows:
The total amount of energy needed is the sum of all energy changes calculated in the above steps.
It is calculated as follows:
The amount of heat energy needed to convert 866g of ice at –15°Cto steam at
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Chapter 11 Solutions
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