nce. 3. Calculate the energy required to melt 2 kg of ice. Given specific latent heat of fusion of ice is 336x 10 J/kg An iron rod at 80°C of mass 0.8 kn is dronner inte no
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Class 11
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>>Thermal Properties of Matter
>>Latent Heat
>>Calculate the mass of ice required to lo
Question

Calculate the mass of ice required to lower the temperature of 300g of water at 40°C to water at 0°C. (Specific latent heat of ice = 336 J /g, Specific heat
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Heat extracted by ice at 0oC to melt = Heat given by water to reach 0oC from 40oC.
ML=mcθ
Where, θ = change in temperature of water
L = Specific Latent heat of ice
c = Specific heat capacity of water
M = Mass of ice required
m = mass of water
M×336=300×4.2×(40−0)
M=336300×4.2×40=150g
∴ Ice required to lower the temperature of water =150g
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