Concept explainers
Calculate the heat absorbed when 542 g of ice at
Interpretation:
The heat absorbed when ice is converted into steam is to be determined.
Concept Introduction:
Phase change is the process by which ice is converted into steam. Each phase change occurs at a constant temperature along with a change in energy. This change in energy is called the heat of that process,
The heat absorbed or released by a substance is calculated by the following equation:
Here,
The expression to calculate the value of
Here
Substitute (2) in (1)
Answer to Problem 37QP
Solution:
The heat absorbed when ice is converted into steam is
Explanation of Solution
Given Information: Mass of ice is
Using equation (3) to calculate the heat required to raise the temperature of ice from
Substitute
Calculate the heat change for the melting of ice by multiplying the molar heat of fusion by the number of moles,
Using equation (3) to calculate the heat required to raise the temperature of water from
Substitute
Now, calculate the heat change for the evaporation of water by multiplying the molar heat of vaporization by the number of moles.
Using equation (3) to calculate the heat required to raise the temperature of water from
Substitute
Calculate the total heat absorbed in the entire process by adding the heats for the individual steps as follows.
So, the total heat absorbed in the process is
The heat absorbed when ice is converted into steam is
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