Lacey_Che131_S2012_Lect-14s

# Lacey_Che131_S2012_Lect-14s - Heating Curve Lec-14...

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l h l f f Lec-14: Calorimetry; Enthalpies of formation Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 1 Heating Curve heat in, q = nc p ( g ) Δ T heat in, q = nc p ( l ) Δ T heat in, q = nc p ( s ) Δ T Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 2 Heating Curves and Calorimetry heat in, q = n Δ H vap heat in q = n Δ H heat in, = fus Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 3 10 g of steam at 100°C is added to 50 g of ice at 0°C. Heat and change of state Find the amount of ice melted and the final temperature Heat loss (steam) -q = Heat gain (ice & water) +q k Steam Ice melts at T = 0C o Raise temp of water Steam 10 ( ) 40.65 22.58 18 50 50 g kJ q steam mol kJ g mol g kJ g kJ = × = − ⎟⎜ o 22.58 6.0 0.0753 18 18 28.3 C kJ mol mol T g mol g mol T = × + × Δ Δ = Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 4

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