Question

Plz.. Solve the ques. ​

Answer 1

Answer:

The latent heat of fusion of substance is 30 cal/g.

Explanation:

We know for no change of phase,

all heat supplied , Q = mc∆T is used to raise temperature only.

But during phase change there is no temperature change of the substance.

All heat supplied is used to change the state.

All heat supplied is used to change the state.Q = mL

where L is latent heat.

Using the above logic and formula we can reach the conclusion that

i) between time 5 to 20 minutes there is first phase change, fusion

ii) between time 30 to 40 minutes there is second phase change, evaporation.

Detailed solution is in the attached diagram.