Font (6) 7. Type \"increase\", \"decrease\", or no change\" in the blank spaces

Question

Font (6) 7. Type "increase", "decrease", or no change" in the blank spaces in the table below to indicate how the concentration of each gas will change to re-establish equilibrium after a reactant or product is added. Change C2H added C H4 Cl2 C2H4Cl2 (5) 8. Consider the system at equilibrium: PCChe PCse + heat Choose one answer and delete the others both 0.0330 Mat equilibrium, what is the concentration of PClo? Show your work! (a) If the temperature is increased, the system will (shift left / shift right /no change). (b) The equilibrium constant for this reaction is 82.64. If the concentrations of PCls and Cbo are 0 rch

Explanation / Answer

(6) 7.

C2H4(g) + Cl2(g) <---->C2H4Cl2(g)

Th problem can be solved by Le Chatliers Principle

(5) 8.

PCl3(g) + Cl2 (g) <-----> PCl5 (g) + Heat

(a) The reaction (forward) is exothermic, hence when temperature is increased backward reaction will be favoured (endothermic) Thus system will shift left.

(b) K = [PCl3][Cl2] / [PCl5]

[PCl5] = [PCl3][Cl2] / K = (0.0330M) (0.0330M) / 82.64 = 1.32 X 10-5M

Change C2H4 Cl2 C2H4Cl2 C2H4 added decrease decrese increase C2H4Cl2 Added Increase Increase decrease

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