Concept explainers
Interpretation:
The amount of energy required to raise 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 7PE
The amount of energy required to raise the temperature of
Explanation of Solution
The mass of solid zinc is
The melting temperature of the solid zinc is
The required initial temperature is
The required final temperature is
The amount of energy required to raise the temperature of zinc from
Where,
•
•
•
•
The specific heat of zinc (solid) is
Substitute the mass, final, initial temperature and specific heat of zinc in equation (1).
The amount of energy required for phase transformation is calculated by the formula shown below.
Where,
•
The heat of fusion of zinc is
Substitute the mass and heat of fusion in equation (2).
The amount of energy required to raise the temperature of zinc from
Where,
•
•
•
•
The specific heat of zinc (liquid) is
Substitute the mass, final, initial temperature and specific heat of zinc in equation (3).
The total amount of energy sample gained when temperature is changed from
Substitute the value of energies in the above equation.
Therefore, the amount of energy required to raise the temperature of
The amount of energy required to raise the temperature of
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