The "Hydrogen Economy" relies on dihydrogen as a superior commercial fuel. Comparing the energy rele — Hydrogen Chemistry Question
Question
The "Hydrogen Economy" relies on dihydrogen as a superior commercial fuel. Comparing the energy released upon combustion, which of the following gives the correct decreasing order of calorific value per gram of fuel?
Answer: B
💡 Solution & Explanation
Dihydrogen has an exceptionally high calorific value. Gaseous $H_2$ releases $143\text{ kJ/g}$, liquid $H_2$ releases $142\text{ kJ/g}$, LPG releases roughly $53\text{ kJ/g}$, and Methane releases $50\text{ kJ/g}$.
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