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a 24.21g sample H2O ice initially at -20°C is heated & converted into steam at 120°C. Calculate amount of heat required ∆H°vap=40.8kJ/mol, s(H2Ol)=4.18J/g•°C, s(H20s)=2.01J/g•°C, s(H2Og)=2.05J/g•°C