WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC offline past questions - with all answers and explanations in one app - Download for free

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.

WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC offline past questions - with all answers and explanations in one app - Download for free
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
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.

 


Report an Error Ask A Question Download App
WAEC offline past questions - with all answers and explanations in one app - Download for free
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709

Contributions ({{ comment_count }})

Please wait...

{{ settings.no_comment_msg ? settings.no_comment_msg : 'There are no comments' }}

Quick Questions

Post your Contribution

Please don't post or ask to join a "Group" or "Whatsapp Group" as a comment. It will be deleted. To join or start a group, please click here

{{ quote.posted_by.display_name }}
{{ settings.form_textarea_description }}
 
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC offline past questions - with all answers and explanations in one app - Download for free
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
WAEC May/June 2024 - Practice for Objective & Theory - From 1988 till date, download app now - 99995
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC offline past questions - with all answers and explanations in one app - Download for free