We have to estimate the time for which a 100-W lamp can be kept burning by the fusion of 1.00 kg of deuterium. The nuclear reaction for the fusion of deuterium is

The atomic mass of deuterium is 2.014 u.

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The atomic mass of deuterium is 2.014 u. Therefore, number of atoms in 1.00 kg of deuterium will be

The for fusion of two deuterium nuclides is 3.27 MeV. Therefore, the energy that can be liberated in fusion of 1.0 kg of deuterium will be

A 100-W bulb consumes 100 J of energy per second. Therefore, the bulb will light with the energy liberated from 1.0 kg of deuterium for