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Hydrogen cyanide is a highly poisonous, volatile liquid. One way in which it can be prepared is by the reaction: CH, (g) + NH; (g) –→ HCN (g) + 3 H2 (g) Use Hess' law and the following thermochemical equations to find the heat of the above reaction at constant pressure. N2 (g) + 3 H2 (g) →2 NH3 (g); AH = -91,8 kJ C (graphite) + 2 H2 (g) → CH4 (g); AH = -74,9 kJ H2 (g) + 2 C (graphite) + N2 (g) → 2 HCN (g); AH = 270,3 kJ [4]

Hydrogen cyanide is a highly poisonous, volatile liquid. One way in which it can be prepared is by the reaction: CH, (g) + NH; (g) –→ HCN (g) + 3 H2 (g) Use Hess' law and the following thermochemical equations to find the heat of the above reaction at constant pressure. N2 (g) + 3 H2 (g) →2 NH3 (g); AH = -91,8 kJ C (graphite) + 2 H2 (g) → CH4 (g); AH = -74,9 kJ H2 (g) + 2 C (graphite) + N2 (g) → 2 HCN (g); AH = 270,3 kJ [4]

Chemistry: Principles and Reactions
Chemistry: Principles and Reactions
8th Edition
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:William L. Masterton, Cecile N. Hurley
Chapter8: Thermochemistry
Section: Chapter Questions
Problem 42QAP: When hydrazine reacts with oxygen, nitrogen gas and steam are formed. (a) Write a thermochemical...
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5. Hydrogen cyanide is a highly poisonous, volatile liquid. One way in which it can be prepared is by the reaction: CH4 (g) + NH3 (g)→ HCN (g) + 3 H2 (g) Use Hess' law and the following thermochemical equations to find the heat of the above reaction at constant pressure. N2 (g) + 3 H2 (g) → 2 NH3 (g); AH =-91,8 kJ C (graphite) + 2 H2 (g) → CH4 (g); AH =-74,9 kJ H2 (g) + 2 C (graphite) + N2 (g) → 2 HCN (g); AH = 270,3 kJ [4] %3D
Transcribed Image Text:5. Hydrogen cyanide is a highly poisonous, volatile liquid. One way in which it can be prepared is by the reaction: CH4 (g) + NH3 (g)→ HCN (g) + 3 H2 (g) Use Hess' law and the following thermochemical equations to find the heat of the above reaction at constant pressure. N2 (g) + 3 H2 (g) → 2 NH3 (g); AH =-91,8 kJ C (graphite) + 2 H2 (g) → CH4 (g); AH =-74,9 kJ H2 (g) + 2 C (graphite) + N2 (g) → 2 HCN (g); AH = 270,3 kJ [4] %3D
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