calculus question

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calculus question
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Prof.Demidko
School: UC Berkeley

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CHEM 135 chapter 15 homework (chemical equilibrium)

1. Write the equilibrium constant expressions for Kc and for Kp for these reactions:
a. Kc = [NH3]2/[{NO2}2{H2}]7 Kp=[PNH3]2/[{PNO2}2{PH2}]7

b. Kc= [SO2] 2/[O2] 3

c. Kc=[CO] 2/[CO2]

Kp=[PSO2]2/[PO2]3

KP=[PCO]2/[PCO2]

d. Kc = [H+][C6H5COO-]/[C6H5COOH]

KP=has no expression

2. Given the following reaction: 2H2 (g) + S2 (g)  2H2S (g)
[H₂] = n (H₂) / V = 2.50 mol / 12L = 0.2083 M
[S₂] = n (H₂) / V = 1.35x10^ -5 mol / 12L = 1.125x10^ -6 M
[H₂S] = n (H₂) / V = 8.70 mol / 12L = 0.725 M
The equilibrium constant Kc is equal to concentrations of the reacting components raised
to the power of their stoichiometric coefficient (reactants coefficient count negative).
Commonly it is calculated from concentrations in mol/L.
Hence:
Kc = [H₂S] / ([H₂]² · [S₂])
= 0.725 / (0.2083² · 1.125x10 -6)
= 14.848*106 mol-1.L
3. A reaction vessel contains 0.25 M NH3, 0.11 M N2, and 1.91 M H2 at equilibrium. Calculate
Kc for th...

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