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1990 WAEC Chemistry Theory Consider the reaction represented by the equation: 2SO\(_{2(g)}\) + O\(_{2(g)}\)   2SO\(_{3(g)}\). \(\Delta\)H = 188KJ....

Chemistry
WAEC 1990

Consider the reaction represented by the equation: 2SO\(_{2(g)}\) + O\(_{2(g)}\)   2SO\(_{3(g)}\). \(\Delta\)H = 188KJ.

(a) Write an expression for the equilibrium constant

(b) Sketch an energy diagram for the forward reaction, showing the profile for the catalyzed and non-catalyzed systems.

(c) state the reason, the effect of the following on the position of equilibrium of the system:

(i) increase in temperature

(ii) increase in pressure;

(iii) removal of some of the SO\(_3\) produced;

(iv) presence of V\(_2\)O\(_5\)

(d)(i) Write equations to show how the sulphur(VI) oxide is converted to tetraoxosulphate(VI) acid in the contact process

(ii) Give two uses of tetraoxosulphate(VI) acid.

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Explanation

(a) Equilibrium constant (Kc) = \(\frac{[SO_3]}{[SO]^2 \times [O_2]}\)

(b) The reaction profile; 2SO\(_{2(g)}\) + O\(_{2(g)}\) \(\to\) 2SO\(_{3(g)}\)

(c)(i) (i) Increase in temperature low of SO\(_{3(g)}\) because the contact proc Decrease in temperature favour E more SO\(_{3(g)}\).

(ii) Increase in pressure favour the more production of SO\(_{3(g)}\) because of moles is present in the prod reactant side of the overall read process.

(iii) Removal of some of the SO\(_{3(g)}\) produced will favour the forward flow of the Chatelier's principle about Equilibrium 

(iv) Presence of V\(_2\)O\(_5\), it acts as a fasten the more production SO\(_{3(g)}\) temperature.

 

(d) Step I: 2SO\(_{2(g)}\) + O\(_{2(g)}\) \(\to\) 2SO\(_{3(g)}\) (Contact process)

Step II: H\(_2\)SO\(_{4(aq)}\) + SO\(_{2(g)}\) \(\to\) 2H\(_2\)S\(_2\)O\(_{7(aq)}\) Oleum fuming liquid conc

Step III: H\(_2\)S\(_2\)O\(_{7(aq)}\) + 2H\(_2\)O\(_{(l)}\) \(\to\) 2H\(_2\)SO\(_{4(aq)}\)  tetraoxosulphate (VI) acid

 

(ii) Tetraoxosulphate (IV) acid can be used for the manufacture of paints and pigment. It can also be used for making detergents and soap.

 


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