The quantity of heat energy required to melt completely 1 kg of ice at – 30oC is
[latent heat of fusion = 3.5 x 10 5Jkg -1, specific heat capacity of ice = 2.1×10 3Jkg -1K -1]
[latent heat of fusion = 3.5 x 10 5Jkg -1, specific heat capacity of ice = 2.1×10 3Jkg -1K -1]
-
A.
4.13×10 6J -
B.
4.13×10 5J -
C.
3.56×10 4J -
D.
3.56×10 2J
Correct Answer: Option B
Explanation
Q = mL + mcθ = 1 x 3.5 x 10 5 + 1 x 2.1 x 10 3 x 30