Lacey_Che131_S2012_Lect-14s

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

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Lec-14: Calorimetry; Enthalpies of formation Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 1 Heating Curve heat in, = n Δ , q p ( g ) heat in, = nc p ( l ) Δ T heat in, = p ( s ) Δ Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 2 Heating Curves and Calorimetry heat in, = Δ H vap eat in heat in, = Δ 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 g g Find the amount of ice melted and the final temperature Heat loss (steam) -q = Heat gain (ice & water) +q Steam Ice melts at T = 0C o Raise temp of water Steam 10 ( ) 40.65 22.58 18 0 50 g kJ qs team mo l kJ gm o l k J g k J ⎛⎞ −= × = ⎜⎟ ⎝⎠ o 50 22.58 6.0 0.0753 18 18 2 .3 C gk kJ mol mol T o l g m o l Δ = Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 4 28.3 C T Δ
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Enthalpy Change 4 How much energy is required to raise the temp of 2.0 10 L f waterfrom200 Cto25 C C 41 4 J/ C g × oo o s s of water from 20.0 C to 25 C. C4 .1 q = m C 84 J/ C g. 5 T ×Δ = Mass d = 1 C .0 g/m T Δ = = o 4 2.0 10 L ml 1000 l Mass = 1.0 g/ml ×× × V 7 8 2.0 10 4.184 J/ C L q = 5 C = 4 184 10 g. g ×⋅ × × = 4.184 J × Roy A. Lacey, Stony Brook University; Che 131, Spring 2012 5 Enthalpy Change .562 of graphite is burnt in a calorimeter at 25 C and 1 atm. If the temp raises to 25.89 C and the heat capacity of the g o o p py calorimeter C 20.7 kJ/ C, what is the molar heat of reaction ? = o n q = -C T Δ rxn 0.89 C q
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This note was uploaded on 03/29/2012 for the course CHE 131 taught by Professor Kerber during the Spring '08 term at SUNY Stony Brook.

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

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