20. If the equilibrium shown below is heated at a constant pressure. H2(g) +12(g

Question

20. If the equilibrium shown below is heated at a constant pressure. H2(g) +12(g)2HI(g) +65 kJ What is most likely to happen? a. Keq gets larger b. Keq gets smaller. c. [Hal gets smaller. Both a. and c. Both b. and e. d. e. 21. What interpretation is correct for the following graph, which shows the reaction to some changs imposed on the equilibrium of the following system: PCIs(g) +92.5kJPCl (g)+ Cl(g) PCl [Cly time The temperature was decreased. The pressure was increased. d. a. Some PCls(g) was injected. b. Some PCls(g) was removed. c. The temperature was increased. e.

Explanation / Answer

20) b. Keq gets smaller

H2(g) + I2(g) <========> 2HI + 65kJ

By increasing the temperature (heating) the equilibrium shifts in the direction of decreasing the temperature i.e. backward direction.

Therefore Keq gets smaller.

21) a. Some PCl5(g) was injected

PCl5(g) + 92.5 kJ <=========> PCl3(g) + Cl2(g)

By injecting PCl5, the equilibrium shifts in forward direction where concentration of PCl3 and Cl2 increases and concentrationof PCl5 decreases.The same is given in the grap.

If temperature is decreased then the equilibrium shifts in backward direction.

If some PCl5 is removed then the equilibrium shifts in backward direction.

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