DHF (kJ/mol)CompoundNH:(g)CH.(g)HCN(g)H,O(g)-46.0-75.0135.1-242.06) Heat of formation values for four compounds are given in the table above.a) Calculate DHpn for the reaction 2NH;(g) + 30,(g) + 2CH,(9) → 2HCN(9) + 6H,O(g)b) Sketch an energy diagram for this change. Clearly label the reactants, products andc) As the reaction takes place, would the reaction container increase or decrease intemperature? Explain in terms of system and surroundings.d) Calculate the heat involved when 55.5 g of NH; reacts with excess oxygen andmethane.

2NH3(g) + 3O2(g)+ 2CH4(g) →2HCN(g) + 6 H2O∆H∘ = ∆Hf(products) -∆H(reactants) =(2HCN +…

Answered: DHE (kJ/mol) Compound NH (g) CH.(9)…

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 5.34QE

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DHF (kJ/mol)
Compound
NH:(g)
CH.(g)
HCN(g)
H,O(g)
-46.0
-75.0
135.1
-242.0
6) Heat of formation values for four compounds are given in the table above.
a) Calculate DHpn for the reaction 2NH;(g) + 30,(g) + 2CH,(9) → 2HCN(9) + 6H,O(g)
b) Sketch an energy diagram for this change. Clearly label the reactants, products and
c) As the reaction takes place, would the reaction container increase or decrease in
temperature? Explain in terms of system and surroundings.
d) Calculate the heat involved when 55.5 g of NH; reacts with excess oxygen and
methane.

Expert Solution

Step 1

$2 N H_{3} (g) + 3 O_{2} (g) + 2 C H_{4} (g) \to 2 H C N (g) + 6 H_{2} O ∆ H^{\circ} = ∆ H f (p r o d u c t s) - ∆ H (r e a c \tan t s) = (2 H C N + 6 H_{2} O) - (2 N H_{3} + 3 O_{2} + 2 C H_{4}) = (2 \times 135.1 + 6 \times (- 242)) - (2 \times (- 46) + 3 (0) + 2 (- 75) = - 1181.8 - (- 242) = - 939.8 K J / m o l$

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