C2H2 (g) + 3/2 CO2 (g) —> CO2 (g) + H2O (l) ΔH = - 1301.1 kJ For the reaction, 2CO2 (g) + 2H2O (l) —> 2 C2H2 (g) + 3 CO2 (g) What is the ΔH for the reaction? a. ΔH = 1301.1 kJ b. ΔH = - 1301.1 kJ c. ΔH = 2602.2 kJ d. ΔH = - 2602.2 kJ

Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter5: Thermochemistry
Section: Chapter Questions
Problem 5.41QE
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  1. An oxyacetylene torch is a tool that mixes and burns oxygen and acetylene to produce an extremely hot flame. This tool is used to cut steel or weld iron and other metals. The temperature of the film can reach 3480 oC. The burning of acetylene is given by the thermochemical equation:

C2H2 (g) + 3/2 CO2 (g) —> CO2 (g) + H2O (l) ΔH = - 1301.1 kJ

For the reaction,

2CO2 (g) + 2H2O (l) —> 2 C2H2 (g) + 3 CO2 (g)

What is the ΔH for the reaction? a. ΔH = 1301.1 kJ b. ΔH = - 1301.1 kJ c. ΔH = 2602.2 kJ d. ΔH = - 2602.2 kJ

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