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: Option B
Explanation
Pt = mL
L = (frac{pt}{m} = frac{90 times 5}{180})
= 2.5