
(a)
Interpretation: The amount of calories of energy transferred to raise the temperature of 50 g of water from 25 oC to boiling needs to be determined.
Concept Introduction:
The amount of energy transferred for the given mass of substance can be calculated as follows:
Here, m is mass, c is specific heat capacity and
(a)

Answer to Problem 5RE
3750 cal.
Explanation of Solution
The specific heat capacity of water is 1 cal/g oC. The mass of water is 50 g. Also, the initial and final temperature is 25 oC and 100 oC respectively.
The calories of energy can be calculated as follows:
Putting the values,
The amount of calories of energy transferred to raise the temperature of 50 g of water from 25 oC to boiling is 3750 cal.
(b)
Interpretation: The amount of calories of energy transferred to lower the temperature of 100 g of water from boiling to 25 oC needs to be determined.
Concept Introduction:
The amount of energy transferred for the given mass of substance can be calculated as follows:
Here, m is mass, c is specific heat capacity and
(b)

Answer to Problem 5RE
-7500 cal.
Explanation of Solution
The specific heat capacity of water is 1 cal/g oC. The mass of water is 100 g. Also, the initial and final temperature is 100 oC and 25 oC respectively.
The calories of energy can be calculated as follows:
Putting the values,
Thus, the amount of calories of energy transferred to lower the temperature of 100 g of water from boiling to 25 oC is -7500 cal.
Chapter U5 Solutions
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