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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![Ice of mass 50g at 0°C was completely melted by 70% of the total heat energy supplied. Calculate the total heat energy supplied [Specific latent heat of fusion of ice = 336Jg−1]](https://erudites.ng/wp-content/plugins/contextual-related-posts/default.png "Ice of mass 50g at 0°C was completely melted by 70% of the total heat energy supplied. Calculate the total heat energy supplied [Specific latent heat of fusion of ice = 336Jg−1]")