Lecture 10 notes (exam 2 review)

T must be stated if it isnt assume 25 c h is a molar

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Unformatted text preview: T remains constant. Example: Convert ice at -50 C to water at +50 C Temperature (°C) ‐50 ‐25 0 25 50 q is positive the change is endothermic Steam Condenses: H2O(g) → H2O(l) c (J g‐1 °C‐1) cm (J mol‐1 °C‐1) Substance Heat Capacity Ice is melting. T remains at 0°C Water warms from 0 to 50°C Ice warms from ‐50 to 0°C 0 100 200 300 400 500 600 Quantity of energy transferred (J) 5 2/6/2009 Thermochemical Expressions ΔH = qP can be added to a balanced equation. CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(g) ΔH° = −803.05 kJ CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(l) Enthalpy Changes for Chemical Reactions Calculate the heat generated when 500. g of propane burns in excess O2. C3H8(l) + 5 O2(g) 3 CO2(g) + 4 H2O(l) ΔH° = – 2220. kJ ΔH° = −890.36 kJ ΔH is the standard enthalpy change P = 1 bar. T must be stated (if it isn’t, assume 25 C)....
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This note was uploaded on 03/02/2014 for the course CHEM 101 taught by Professor Multipleprofs during the Spring '07 term at Drexel.

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