For a reaction a A+ b B c C+ d D the equilibrium constant K is defined as the ra

Question

For a reaction

aA+bBcC+dD

the equilibrium constant K is defined as the ratio of products to reactants at equilibrium:

K=[C]c[D]d[A]a[B]b

Because K represents the ratio of products to reactants, the magnitude of K is an indicator of the levels of products and reactants present when the reaction is at equilibrium. Some chemical reactions proceed almost fully to product, whereas other chemicals hardly react with each other at all, or react so as to have significant amounts of both reactants and products at equilibrium.

Part A

Hydrogen is used as a rocket fuel because it is very light and reacts explosively and completely with oxygen. For the combustion reaction

2H2(g)+O2(g)2H2O(g)

what is the likely magnitude of the equilibrium constant K ?

K<103

103<K<103

K=0

K>103

Part B

The industrial production of lime (CaO ) from calcium carbonate is accomplished via the following reaction:

CaCO3(s)CaO(s)+CO2(g)

Given the following data:

Temperature (K )

K

298

1.93×1023

1200

1.01

what can be said about this reaction?

Lower temperatures result in more lime formation.

The reaction makes more lime at higher temperatures.

The reaction goes to completion at 1200 K .

The equilibrium lies far to the right at room temperature.

Part C

For the reaction

2H2S(g)2H2(g)+S2(g);    K=106 at 1000 K

what can be said about this reaction at this temperature?

The equilibrium lies far to the right.

The reaction will proceed very slowly.

The reaction contains significant amounts of products and reactants at equilibrium.

The equilibrium lies far to the left.

Part D

For the reaction

HCONH2(g)NH3(g)+CO(g);    K=4.84 at 400 K

what can be said about this reaction at this temperature?

The equilibrium lies far to the right.

The reaction will proceed very slowly.

The reaction contains significant amounts of products and reactants at equilibrium.

The equilibrium lies far to the left.

K<103

103<K<103

K=0

K>103

Explanation / Answer

Part A K > 103 because the reaction is explosive and goes to completion very swiftly.

Part B The reaction makes more lime at higher temperature. With increase in temperature K has increased so lime concetration in products side increases.

Part C The equilibrium lies far to the left.

Part D The reaction contains significant amounts of products and reactants at equilibium.

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