What is the amount of heat required to raise the temperat...
What is the amount of heat required to raise the temperature of a 0.02 kg of ice cube from −10oC to 10oC ?
[specific latent heat of fusion of ice = 3.34 x 105 Jkg−1, Specific heat capacity of water = 4200 Jkg−1 k−1
Specific heat capacity of ice = 2100 Jkg−1 k−1
6680 J
1680 J
7520 J
7940 J
Correct answer is D
Quantity of heat required to raise the temperature of the ice cube from −10oC to 0oC
⇒H=mc►ø = 0.02 × 2100 × 0 -(-10)
⇒ H = 0.02 × 2100 × (0 + 10) = 0.02 × 2100 × 10
⇒ H = 420 J
quantity of heat required to melt ice at 0oC
⇒ H = mL = 0.02 × 3.34 × 105
⇒H=6680 j
Quantity of heat required to raise the temperature of the melted ice cube (water) from 0oC to −10oC
⇒H=mc►ø = 0.02 × 4200 × (10-0)
⇒H = 0.02 × 4200 × 10
⇒H = 840j
;420 + 6680 + 840 = 7940 j
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