Concept explainers
Interpretation: The final temperature of water-iron mixture needs to be determined, if 25.0 g of pure iron at 85°C is dropped in to 75 g of water at 20°C.
Concept Introduction: Specific heat capacity can be defined as the heat in joules that is required to raise the temperature of 1 g of substance by 1°C. The relation between specific heat capacity and heat required is shown below:
Answer to Problem 55A
Explanation of Solution
Given information:
Mass of pure iron = 25.0 g
Initial temperature of pure iron = 85°C
Mass of water = 75 g
Initial temperature of water = 20°C
Specific heat capacity of iron = 0.45 J/g°C
Specific heat capacity of water = 4.184 J/g°C
The heat lose by the metal must be heat gain by water. Thus the equation must be:
Substitute the values to calculate the final temperature:
Thus, the value of
Chapter 10 Solutions
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