A 90-W immersion heater is used to supply energy for five minutes. The energy supplied is used to completely melt 180g of a solid at its the melting point. Neglecting energy losses to the surroundings, calculate the specific latent heat of fusion of the solid

A. 0.5Jg-1
B. 2.5Jg-1
C. 15.0Jg-1
D. 450.0Jg-1
E. 150Jg-1

Correct Answer: Option B

Explanation

Pt = mL

L = pt/m=(90×5)/180

= 2.5

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