How much heat is released when 4.5 g of steam condenses at 100 °C (ΔHvap = 40.7 kJ mol⁻¹, H₂O = 18 g mol⁻¹)?
Correct answer A. 10.2 kJ
Explanation
4.5 g of water is 0.25 mol. Condensation releases the same energy that vaporisation absorbs: 0.25 × 40.7 = 10.2 kJ.
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