Thermodynamics and ThermochemistrymediumMCQ SINGLE

For a specific work, on an average a person requires 5616 kJ of energy. How many kilograms of glucosThermodynamics and Thermochemistry Chemistry Question

Question

For a specific work, on an average a person requires 5616 kJ of energy. How many kilograms of glucose must be consumed if all the required energy has to be derived from glucose only? $\Delta H$ for combustion of glucose is –2808 kJ mol$^{-1}$.

Answer: B

💡 Solution & Explanation

Moles of glucose needed = $5616\text{ kJ} / 2808\text{ kJ/mol} = 2.0\text{ moles}$. Molar mass of glucose is $180\text{ g/mol}$. Mass = $2.0 \times 180\text{ g} = 360\text{ g} = 0.36\text{ kg}$.

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