Concept explainers
Interpretation:
The amount of energy released to lower the temperature of
Concept introduction:
The amount of energy required to change the state of a substance is known as enthalpy. It is the different in the energy of final and initial state of a substance. The negative and positive sign of enthalpy indicates the energy released and energy absorbed, respectively, during the phase change.
Answer to Problem 8PE
The amount of energy released to lower the temperature of
Explanation of Solution
The mass of sample of steam is
The boiling temperature of the water is
The melting temperature of the ice is
The required initial temperature is
The required final temperature is
The amount of energy released to raise the temperature of steam from
Where,
•
•
•
•
The specific heat of steam is
Substitute the mass, final, initial temperature and specific heat of steam in equation (1).
The amount of energy released for phase transformation from gas to liquid is calculated by the formula shown below.
Where,
•
The heat of vaporization of water is
Substitute the mass and heat of vaporization in equation (2).
The amount of energy released to raise the temperature of water from
Where,
•
•
•
•
The specific heat of water is
Substitute the mass, final, initial temperature and specific heat of water in equation (3).
The amount of energy released for phase transformation from solid to liquid is calculated by the formula shown below.
Where,
•
The heat of fusion of ice is
Substitute the mass and heat of fusion in equation (4).
The amount of energy released to raise the temperature of ice from
Where,
•
•
•
•
The specific heat of ice is
Substitute the mass, final, initial temperature and specific heat of ice in equation (5).
The total amount of energy sample released when temperature is changed from
Substitute the value of energies in the above equation.
Therefore, the amount of energy released to lower the temperature of
The amount of energy released to lower the temperature of
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