Interpretation:The conservation of energy is to be shown in the two given processes.
Concept introduction: According to law, of conservation of energy, energy is always conserved. Energy cannot be created or destroyed in a reaction.
The formula to calculate heat transfer is,
Where H is heat transfer, m is mass, c is specific heat capacity and
The formula to calculate heat transfer using the mass and heat of fusion is,
Where H is heat transfer and L is the heat of fusion.
Answer to Problem 9E
Conservation of energy is shown.
Explanation of Solution
25 g ice melts and then goes to
PROCESS 1:
Heat of fusion of water (S)=80 cal/g
Mass of sample= 25 g
Heat required to melt can be calculated as,
Specific heat of water (c)=
Final temperature=
Heat transferred can be calculated as,
PROCESS 2:
Mass (m)=100g
Change in temperature
Specific heat =
From process (1) and (2), it is clear that energy is conserved.
Energy is always conserved.
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