Name: Ramoune Scarlett College ID: Thomas Edison State College General Chemistry I with Labs Section no.: Semester and year: May 2020 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/mola.Is this reaction endothermic or exothermic? (2 points) b.What is the value of ∆H if the equation is multiplied throughout by 2? points) (2 c.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) d.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) 1 Copyright © 2014 by Thomas Edison State College. All rights reserved.
You've reached the end of your free preview.
Want to read all 6 pages?