[* بيبو *]

6. For the following reaction at equilibrium, which choice gives a change that will shift the position of equilibrium to favor formation of more products?
2NOBr(g) 2NO(g) + Br2(g), DHºrxn = 30 kJ/mol
A. Increase the total pressure by decreasing the volume.
B. Add more NO.
C. Remove Br2.
D. Lower the temperature.
7. For the following reaction at equilibrium in a reaction vessel, which one of these changes would cause the Br2 concentration to decrease?
2NOBr(g) 2NO(g) + Br2(g), DHºrxn= 30 kJ/mol
A. Increase the temperature.
B. Remove some NO.
C. Add more NOBr.
D. Compress the gas mixture into a smaller volume.

8. For the reaction at equilibrium 2SO3 2SO2 + O2 (DHºrxn= 198 kJ/mol), if we increase the reaction temperature, the equilibrium will

A. shift to the right.
B. shift to the left.
C. not shift.
D. The question cannot be answered because the equilibrium constant is not given.

9. For the equilibrium reaction 2SO2(g) + O2(g) 2SO3(g), DHºrxn = -198 kJ/mol. Which one of these factors would cause the equilibrium constant to increase?
A. Decrease the temperature.
B. Add SO2 gas.
C. Remove O2 gas.
D. Add a catalyst.
E. none of these

10. The reaction 2SO3(g) 2SO2(g) + O2(g) is endothermic. If the temperature is increased,

A. more SO3 will be produced.
B. Kc will decrease.
C. no change will occur in Kc .
D. Kc will increase.
E. the pressure will decrease


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