Written 7.docx - Name James Burton College ID Thomas Edison State University General Chemistry I with Labs(CHE-121 Section no Semester and year Written

Written 7.docx - Name James Burton College ID Thomas Edison...

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Name: James Burton College ID: Thomas Edison State University General Chemistry I with Labs (CHE-121) Section no.: Semester and year: Written Assignment 7: Energy and Thermochemistry Answer all assigned questions and problems, and show all work. 1.Consider this reaction:2CH3OH(l) + 3O2(g) → 4H2O(l) + 2CO2(g)H= –1452.8 kJ/mol1.Is this reaction endothermic or exothermic? (2 points) 2.What is the value of ∆H if the equation is multiplied throughout by 2? (2 points) 3.What is the value of ∆Hif the direction of the reaction is reversed so that the products become the reactants and vice versa? (2 points) 4.What is the value of ∆Hif water vapor instead of liquid water is formed as the product? (2 points) 2.The first step in the industrial recovery of zinc from the zinc sulfide ore is roasting, that is, the conversion of ZnS to ZnO by heating:2ZnS(s) + 3O2(g) → 3ZnO(s) + 2SO2(g) ∆H= –879 kJ/molCalculate the heat evolved (in kJ) per gram of ZnS roasted. (5 points) 97.47g.(Reference: Chang 6.25)
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3.A 6.22 kg piece of copper metal is heated from 20.5 °C to 324.3 °C. Calculate the heat
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