A substance initially in solid state at `0^@`C is heated. The graph showing the variation in temperature with the amount of heat supplied is shown in Fig. 11.7. If the specific heat capacity of the solid substance is 500 J `kg^(-1)^@C^(-1)`, use graph to find : (i) the mass of the substance, and (ii) the specific latent heat of fusion of the substance in the liquid state.

Explanation

To solve the problem step by step, we will analyze the graph and use the given data to find the mass of the substance and the specific latent heat of fusion.

### Step 1: Analyze the Graph
From the graph, we identify the following key points:
- From point A to B, the temperature increases from 0°C to 80°C.
- From point B to C, the temperature remains constant while the substance changes from solid to liquid (phase change).
- From point C to D, the temperature of the liquid increases.

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