In a nuclear fusion reaction, the loss in mass is 0.3%. How much energy is released in the fusion of 1 kg mass ?

Explanation

To solve the problem of how much energy is released in the fusion of 1 kg mass with a mass loss of 0.3%, we can follow these steps:

### Step 1: Calculate the mass defect (Δm)
The mass defect is given as 0.3% of the total mass. For a mass of 1 kg, we can calculate the mass defect as follows:

\[ \Delta m = 0.3\% \text{ of } 1 \text{ kg} = \frac{0.3}{100} \times 1 \text{ kg} = 0.003 \text{ kg} = 3 \times 10^{-3} \text{ kg} \]
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