What is the energy change when 72 g of H₂O(g) condense to a liquid at 373 K? (ΔH_vap of water = 40.68 kJ/mol; molar mass of H₂O = 18 g/mol)

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Quizplus · Accepted Answer

The energy change is calculated using the formula: Energy change = moles × ΔHvap. First, calculate the moles of water: 72 g / 18 g/mol = 4 moles. Then, multiply by ΔHvap: 4 moles × 40.68 kJ/mol = 162.72 kJ, which is approximately 160 kJ.

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What Is the Energy Change When 72 G of H₂O