For the reaction: 2H₂O(l) + 137 kcal → 2H₂ (g) + O₂ (g) how many kcal are needed to react 50.0 g H₂O(l)?

Name: For the reaction: 2H₂O(l) + 137 kcal → 2H₂ (g) + O₂ (g) how many kcal are needed to react 50.0 g H₂O(l)?
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Question

Quizplus · Accepted Answer

The molar mass of H₂O is 18 g/mol. For 50.0 g of H₂O, the number of moles is 50.0 g / 18 g/mol = 2.78 mol. The reaction requires 137 kcal for 2 moles of H₂O, so for 2.78 moles, it requires (137 kcal / 2 moles) * 2.78 moles = 190.7 kcal, which rounds to 190. kcal.

For the Reaction: 2H₂O(l) + 137 Kcal → 2H₂ (G)