5:19 minutes
Problem 76
Textbook Question

Calcium carbide 1CaC22 reacts with water to form acetylene 1C2H22 and Ca1OH22. From the following enthalpy of reaction data and data in Appendix C, calculate Hf° for CaC21s2: CaC21s2 + 2 H2O1l2 ¡ Ca1OH221s2 + C2H21g2 H° = -127.2 kJ

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