Question

Problem 15.15

Write the expression for Kc for the following reactions. In each case indicate whether the reaction is homogeneous or heterogeneous.

Part A

3NO(g)⇌N2O(g)+NO2(g)

Kc=  

	[N2O][NO2]3[NO]
	[NO]3[N2O][NO2]
	3[NO][N2O][NO2]
	[N2O][NO2][NO]3

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Part B

3NO(g)⇌N2O(g)+NO2(g)

reaction is

	homogeneous
	heterogeneous

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Part C

CH4(g)+2H2S(g)⇌CS2(g)+4H2(g)

Kc=  

	[CH4][H2S]2[CS2][H2]4
	[CH4][H2S]2[CS2][H2]
	2[CS2][H2][CH4][H2S]
	[CS2][H2]4[CH4][H2S]2

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Part D

CH4(g)+2H2S(g)⇌CS2(g)+4H2(g)

reaction is

	homogeneous
	heterogeneous

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Part E

Ni(CO)4(g)⇌Ni(s)+4CO(g)

Kc=  

	[Ni(CO)4]4[CO]
	[Ni(CO)4][CO]4
	[CO]4[Ni(CO)4]
	4[CO][Ni(CO)4]

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Part F

Ni(CO)4(g)⇌Ni(s)+4CO(g)

reaction is

	homogeneous
	heterogeneous

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Part G

HF(aq)⇌H+(aq)+F−(aq)

Kc=  

	[H+][F−][HF]
	[HF][H+][F−]
	[F−][H+][HF]
	[H+][F−][HF]

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Part H

HF(aq)⇌H+(aq)+F−(aq)

reaction is

	homogeneous
	heterogeneous

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Part I

2Ag(s)+Zn2+(aq)⇌2Ag+(aq)+Zn(s)

Kc=  

	[Ag+]2[Zn2+]
	[Zn2+]2[Ag+]
	[Zn2+][Ag+]2
	2[Ag+][Zn2+]

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Part J

2Ag(s)+Zn2+(aq)⇌2Ag+(aq)+Zn(s)

reaction is

	homogeneous
	heterogeneous

Answer 1

part -A

3NO(g)⇌N2O(g)+NO2(g)

Kc = [N2O][NO2]/[NO]³

part-B

3NO(g)⇌N2O(g)+NO2(g)

Reactanta and products are same phase. So it is homogeneous

Part C

CH4(g)+2H2S(g)⇌CS2(g)+4H2(g)

Kc= [CS2][H2]⁴/[CH4][H2S]²

Part D

CH4(g)+2H2S(g)⇌CS2(g)+4H2(g)

reaction is homogeneous .Here reactants and products are same phase.

Part E

Ni(CO)4(g)⇌Ni(s)+4CO(g)

Kc= [CO]⁴/[Ni(CO)4]

Part F

Ni(CO)4(g)⇌Ni(s)+4CO(g)

reaction is heterogeneous because of reactants and products are different phase.

Part G

HF(aq)⇌H+(aq)+F−(aq)

Kc= [F-][H+]/[HF]

Part H

HF(aq)⇌H+(aq)+F−(aq)

reaction is homogeneous

Part I

2Ag(s)+Zn2+(aq)⇌2Ag+(aq)+Zn(s)

Kc= [Ag+]²/[Zn⁺²]

Part J

2Ag(s)+Zn2+(aq)⇌2Ag+(aq)+Zn(s)

reaction is hetreogeneous . Reactants and products are different phase