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General Chemistry

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Equilibrium and Kinetics

Question
6 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


If the reverse reaction of Reaction 1 is endothermic, what is the sign of DH of the reaction in which HI is on the product side?

A Positive
B Negative
C Neither positive nor negative, because the reaction is reversible
D Cannot be predicted, because more data is required regarding the individual enthalpy values
Ans. B According to the question, the reverse reaction of Reaction 1 is endothermic. This means the forward reaction is exothermic. For exothermic reactions, the ΔH is negative.

Equilibrium and Kinetics Flashcard List

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