4. Calcium carbide reacts with water to form acetylene, a gas used in welding. How many KJ of heat are evolved in the reaction of 3.50 kg of CaC2 with 1.25 L of H2O? (Ans:-4440KJ) CaC₂(s) + 2H₂O(1) C2H2(g) + Ca(OH)2(s) AH -128.0 KJ/mol (Strategy: this is a limiting reagent problem. a) convert kg of CaC2 to g and then to mols; b) find the amount of energy released using AH; c) convert L of H2O to kg and then to g of H2O and find mols; d) find the amount of energy released using AH; the lower amount of energy released is the correct answer).
4. Calcium carbide reacts with water to form acetylene, a gas used in welding. How many KJ of heat are evolved in the reaction of 3.50 kg of CaC2 with 1.25 L of H2O? (Ans:-4440KJ) CaC₂(s) + 2H₂O(1) C2H2(g) + Ca(OH)2(s) AH -128.0 KJ/mol (Strategy: this is a limiting reagent problem. a) convert kg of CaC2 to g and then to mols; b) find the amount of energy released using AH; c) convert L of H2O to kg and then to g of H2O and find mols; d) find the amount of energy released using AH; the lower amount of energy released is the correct answer).
Chemistry for Engineering Students
4th Edition
ISBN:9781337398909
Author:Lawrence S. Brown, Tom Holme
Publisher:Lawrence S. Brown, Tom Holme
Chapter9: Energy And Chemistry
Section: Chapter Questions
Problem 9.53PAE: 9.53 Using these reactions, find the standard enthalpy change for the formation of 1 mol of PhO(s)...
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