5) Which reaction will shift to the left in response to a decrease in volume? A)

Question

5) Which reaction will shift to the left in response to a decrease in volume? A)4Fe(s) + 302 (g) 2F9203 (s) B) 2HI ( H2 (g) 12 () C)2S03 ) 2502 (@)-02() D)H2 (g) +Cl2 (g)-2HCl (g) E) N2 (g)+3H2)2NH3(g) 6) At 400 K, the equilibrium constant for the following reaction is Kp-70 Aclosed vessel at 400 K is charged with 100 atm ofBr2 (a). 100atrm ofOga.and 200atm of Brcia. Use to determine which of the statements below Is true A) The reaction will go to completion since there are equal amounts of Br2 and Cl B) The equilibrium partial pressure of BrCI g) will be 4 00 atm C) The equilibrium partial pressures of Br2, Clh, and BrCi will be the same as the initial values D) The equilibrium partial pressure of Brz will be greater than 1,.00 atm E) At equillbrium, the total pressure in the vessel will be less than the initial total pressure 7) Consider the following reaction at equllibrium NH3 @)N2(a) 3H2(g) Le Chatelier's principle predicts that the moles of Hz in the reaction container will increase with_ A) a decrease in the total pressure (T constant) B) a decrease in the total volume of the reaction vessel (T constant) C) an increase in total pressure by the addition of hellum gas (V and T constant D) addition of some N2 to the reaction vessel (V and T constant) E) some removal of NH3 from the reaction vessel (V and T constant) 8)ofthe acids in the table below. is the strongest acid Acid |Ka HOAc 18-10-5 HCHO2 1.8 10- HCIO 3.0 10-8 HF 68-10-4 A) HCIO B) HF C) HOAc D) HCHO2 E) HOAc and HCHO2

Explanation / Answer

5. C

On decreasing the volume the equilibrium will shift to the left, i.e. it will favor the reverse reaction, for those reactions which fewer moles of gas to the left side. In A solid is fomed. In B and D has the same number of moles on each side. And in E, there are more moles of gases to the left.

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