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Question
Find the amount of heat needed to raise the temperature of a piece of iron of mass 500 g by 20 °C. (c = 0.110 cal/g.°C)
Solution
Given: Mass (m) = 500 g, change in temperature (ΔT) = 20 °C
specific heat of iron (c) = 0.110 cal/g °C
To find: Heat energy (Q)
Formula: Q = m c ΔT
Calculation: According to principle of heat exchange,
Energy supplied to iron piece = Energy gained by iron piece
From formula,
Q = 500 × 0.110 × 20 = 1100 cal
Heat energy needed to raise temperature of piece of iron is 1100 cal.
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