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A 90-W immersion heater is used to supply energy for five mi...

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 is 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 is B

Pt = mL

L = ptm=90×5180

= 2.5