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Calculate the enthalpy change, ΔH Δ H , for the process in which 17.3 g g of water is converted from liquid at 12.9 ∘C ∘ C to vapor at 25.0 ∘C ∘ C . For water, ΔHvap Δ H v a p = 44.0 kJ/mol k J / m o l at 25.0 ∘C ∘ C and Cs C s = 4.18 J/(g⋅∘C) J / ( g ⋅ ∘ C ) for H2O(l) H 2 O ( l ) .