Chemistry Solved_Part_34

Chemistry - Week 20 4 What is Hf reaction for the following reaction Use Hf =-168.3 kcal/mol for AlCl3 and Hf =-39.95 kcal/mol for HCl Is the

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©2010 Digital Interactive Video Education Week 20 101 4) What is ΔH° f reaction for the following reaction? Use ΔH° f = -168.3 kcal/mol for AlCl 3 and ΔH° f = -39.95 kcal/mol for HCl. Is the reaction endothermic or exothermic? 4 pts. 2Al (s) + 6HCl (aq) 2AlCl 3 (s) + 3H 2 (g) 5) The following is a chemical reaction describing the dissolution of solid ammonium chloride (ΔH° f = -75.15 kcal/mol). Would you expect the solution to be cooler or warmer after the ammonium chloride was dissolved? Use ΔH° f = -31.67 kcal/mol for NH 4 + (aq) and ΔH° f = -39.95 kcal/mol for Cl - (aq). 2 pts. NH 4 Cl (s) NH 4 + (aq) + Cl - (aq) 2 moles AlCl 3 (-168.3 kcal/mol) + 3(0) - [2(0) + 6(-39.95 kcal/mol)] -336.6 kcal + 239.7 kcal = -96.9 kcal, exothermic 1 mol NH 4 + (-31.67 ) + 1 mol Cl - (-39.95 ) - [1 mol NH 4 Cl(-75.15 )] -71.62 kcal + 75.15 kcal 3.53 kcal, cooler kcal mol kcal mol kcal mol
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©2010 Digital Interactive Video Education Week 20 102 LESSON 40: 2 nd LAW OF THERMODYNAMICS Assignment:
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This document was uploaded on 10/31/2011 for the course CHM 2046 at University of Florida.

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Chemistry - Week 20 4 What is Hf reaction for the following reaction Use Hf =-168.3 kcal/mol for AlCl3 and Hf =-39.95 kcal/mol for HCl Is the

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