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ICSE Class 10 Physics Question 27 of 27

Solved 2023 Question Paper ICSE Class 10 Physics — Question 16

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16
Question

Question 9(i)

Calculate the total amount of heat energy required to melt 200 g of ice at 0°C to water at 100°C.

(Specific latent heat of ice = 336 J g-1, specific heat capacity of water = 4.2 J g-1°C-1)

Answer

Given,

m = 200 g

specific heat capacity of water = 4.2 J g-1 K-1

specific latent heat of ice = 336 J g-1

total amount of heat energy required = ?

Heat energy taken by ice at 0° C to convert into water at 0° C
= m x L
= 200 × 336
= 67200 J

Heat energy taken by water to raise the temperature from 0° C to 100° C
= m x c x change in temperature
= 200 × 4.2 × (100 - 0)
= 200 × 4.2 × 100
= 84000 J

Total heat energy gained is
= 67200 + 84000
= 1,51,200 J

Hence, total amount of heat energy required = 1,51,200 J