An athlete is given \(100\,g\) of glucose \(\left( C _6 H _{12} O _6\right)\) for energy. This is equivalent to \(1800\,kJ\) of energy.The \(50\, \%\) of this energy gained is utilized by the athlete for sports activities at the event. In order to avoid storage of energy, the weight of extra water he would need to perspire is \(.........g\) (Nearest integer) Assume that there is no other way of consuming stored energy.Given : The enthalpy of evaporation of water is \(45\,kJ\,mol ^{-1}\) Molar mass of \(C , H\) and \(O\) are \(12.1\) and \(16\,g\,mol ^{-1}\)

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.