Consider the reaction H2(g) + I2(g) ? 2HI(g). The reaction of a fixed amount of
ID: 1006146 • Letter: C
Question
Consider the reaction H2(g) + I2(g) ? 2HI(g). The reaction of a fixed amount of H2 and I2 is studied in a cylinder fitted with a movable piston. For each of the following changes, state the effect (if any) on reaction rate, and clearly explain your responses. a) An increase in temperature at constant volume b) An increase in volume at constant temperature c) The addition of a catalyst d) The addition of argon (an inert gas) at constant volume.
Answer: a) increase b) decrease c) increase d) no change
Please Explain.
Explanation / Answer
H2(g) + I2(g) ---> 2HI(g)
a) increase in temperature , increases pressure at constant volume.so that equilibrium shifts towards less no of moles
side.in order to decrease the pressure.so that as the No of moles in both side same in the above equation.there is no effect of increase in temperature at constant volume.
no change
b) increase in volume at constant temperature : results decrease in pressure. as the No of moles in both side same in the above equation.results no effect on equilibrium.
no change
c) addition of a catalyst : increases rate of both forward,backward reaction.
d) addition of argon (an inert gas) at constant volume. : no change.
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