A 90W immersion heater is used to supply energy for 5 minutes. The energy supplied is used to completely melt 160g of a solid at its melting point. Calculate the specific latent heat of the solid.

A. 2.81jg−¹
B. 6.25Jg−¹
C. 8.89Jg−¹
D. 168.75Jg−¹
E. 5333.33Jg−¹

Correct Answer:

Option D = 168.75Jg−¹

Explanation

pt = ml 80

90 x 5 x 60 = 160 x L

L = 27000/160

= 168.75Jg−¹