Question

Part A For the reaction 2CH4(g)?C2H2(g)+3H2(g) K = 0.150 at 1704 ?C . What is Kp...

Part A

For the reaction

2CH4(g)?C2H2(g)+3H2(g)

K = 0.150 at 1704 ?C . What is Kp for the reaction at this temperature?

Express your answer numerically.
Kp =

Part B

For the reaction

N2(g)+3H2(g)?2NH3(g)

Kp = 5.10×10?3 at 251 ?C . What is K for the reaction at this temperature?

Enter your answer numerically.
K =
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Homework Answers

Answer #1

Part a

2CH4(g)?C2H2(g)+3H2(g)

n = sum of stoichiometric coefficient of products - sum of stoichiometric coefficient of reactants

= (3 + 1) - 2 = 2

Gas constant R = 0.0821 L-atm/mol·K

Temperature T = 1704 + 273 = 1977 K

Relation between Kc and Kp

Kp = Kc (RT)n

= 0.150 x (0.0821 x 1977)2

= 3.95 x 10^3

Part b

N2(g)+3H2(g)?2NH3(g)

n = sum of stoichiometric coefficient of products - sum of stoichiometric coefficient of reactants

= (2) - (1+3) = - 2

Gas constant R = 0.0821 L-atm/mol·K

Temperature T = 251 + 273 = 524 K

Relation between Kc and Kp

Kp = Kc (RT)n

5.10 x 10^-3 = Kc x (0.0821 x 524)-2

Kc = 9.44

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