Question

Use LeChatelier's principle to predict the overall effect of the action described in the first column of the following table upon the quantity appearing in the second coulm of the table for the following reaction at equilibrium: (22 points)

2H₂SO₄(aq) + 2NaBr(s) ↔ Br₂(l) + SO₂(g) + Na₂SO₄(aq) + 2H₂O(l) ΔH° = +281.7 kJ/mol

Record your answer by writing increase, decrease, or no change on the line in the third column for each. (2 points each)

Change                                       Quantity                                                Answer

(a) add some NaBr(s)                              moles of NaBr(s)                                       _______________

(b) increase the volume                          moles of SO2(g)                                         ________________

(c) increase the temperature                   moles of Br2(l)                                          _________________

(d) add He(g) at constant V                   moles of SO2(g)                                        _________________

(e) add He(g) at constant V                   Ptot                                                           _________________

(f) remove some NaBr(s)                     [Na2SO4]                                                   __________________

(g) add a catalyst                                  [H2SO4]                                                    _________________

(h) increase the temperature                K                                                                __________________

(i) add some SO2(g)                            moles of H2O(l)                                         __________________

(j) decrease the volume                      K                                                                 _________________

(k) add He(g) at constant Ptot            [Na2SO4]                                                   __________________

(g) add a catalyst                                  [H2SO4]                                                    _________________

(h) increase the temperature                K                                                                __________________

(i) add some SO2(g)                            moles of H2O(l)                                         __________________

(j) decrease the volume                      K                                                                 _________________

(k) add He(g) at constant Ptot            [Na2SO4]                                                   __________________

(g) add a catalyst                                  [H2SO4]                                                    _________________

(h) increase the temperature                K                                                                __________________

(i) add some SO2(g)                            moles of H2O(l)                                         __________________

(j) decrease the volume                      K                                                                 _________________

(k) add He(g) at constant Ptot            [Na2SO4]                                                   __________________

Answer 1

in le chatelier's principles depends on mainly concentration, pressure,temperature,catalyst ,addition of inert gases at constant volume ,addition of inert gases at constant pressure

a) reacion moves forward direction (increase rate of reaction)

b)so2 added reaction moves backward(decrease rate of reaction)

c) reaction moves forward this endothermic reaction

d) pressure remains unchanged so2 not change(at nobel gases helium)

e)total pressure not changed(nobel gases)

f)shift to backward reaction

g)increase rate of reaction

h)k increases

i)no change in H2o

j )decrease volume does not effect k no change(k only depends temperature)

k)n>0 it will shift in forward direction on addition of inert gas

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