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Standard VIII

Chemistry

Specific Heat

Acopper block...

Question

Acopper block of mass 2.5 kg is heated in a furnace to a temperatureof 500 °C and then placed on a large ice block. What is themaximum amount of ice that can melt? (Specific heat of copper = 0.39J g^–1K^–1;heat of fusion of water = 335 J g^–1).

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Solution

Mass of the copper block, m = 2.5 kg = 2500 g
Rise in the temperature of the copper block, Δθ = 500°C
Specific heat of copper, C = 0.39 J g^–1°C^–1
Heat of fusion of water, L = 335 J g^–1
The maximum heat the copper block can lose, Q = mCΔθ
= 2500 × 0.39 × 500
= 487500 J
Let m₁ g be the amount of ice that melts when the copper block is placed on the ice block.
The heat gained by the melted ice, Q = m₁L
Hence, the maximum amount of ice that can melt is 1.45 kg.

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Acopper block of mass 2.5 kg is heated in a furnace to a temperatureof 500 °C and then placed on a large ice block. What is themaximum amount of ice that can melt? (Specific heat of copper = 0.39J g–1 K–1;heat of fusion of water = 335 J g–1).

Acopper block of mass 2.5 kg is heated in a furnace to a temperatureof 500 °C and then placed on a large ice block. What is themaximum amount of ice that can melt? (Specific heat of copper = 0.39J g^–1K^–1;heat of fusion of water = 335 J g^–1).