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General Chemistry

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Equilibrium and Kinetics

Question
12 out of 13
 

At this point of advancements in science, chemists have a good understanding of the kinetics of reactions. They can predict the effects of changes in pH, temperature, and concentration in chemical reactions.

In a cylinder, there is a reaction mixture of hydrogen and iodine. The hydrogen and the iodine react to form hydrogen iodide.

image\27420 ch 11 passage 1.png

The industrial production of ammonia is done by a process called Haber process. The reaction occurs as shown below, and is usually done in the presence of an iron catalyst.

image\27430 ch 11 passage 1.png

ΔH = –92kJ


In Reaction 2 for the production of ammonia from nitrogen and hydrogen, what is most likely to be true about entropy?

A Entropy increases and is positive
B Entropy decreases and is negative
C Entropy increases and is negative
D Entropy increases and is positive
Ans. B Entropy is a thermodynamic quantity which measures the randomness in a system. An increase in randomness means an increase in the entropy. In general, gas phase has a higher entropy than liquid phase, and liquid phase has a higher entropy than solid phase. But in this reaction, all the components are in their gas phases, and the reactant side has more of them. The production of ammonia causes the entropy to decrease because there is less randomness than before the reaction began.

Equilibrium and Kinetics Flashcard List

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