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5. For the reaction H2(g) + I2(g) 2HI(g), Kc = 50.2 at 445ºC. If [H2] = [I2] = [HI] = 1.75 ´ 10-3 M at 445ºC, which one of these statements is true?


A. The system is at equilibrium, thus no concentration changes will occur.
B. The concentrations of HI and I2 will increase as the system approaches equilibrium.
C. The concentration of HI will increase as the system approaches equilibrium.
D. The concentrations of H2 and HI will fall as the system moves toward equilibrium.
E. The concentrations of H2 and I2 will increase as the system approaches equilibrium.




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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