Contact Process

Question 1

Used to make sulfuric acid H2SO4

Answer 1

1) S + O2 => SO2
2) 2SO2 + O2 <=> 2SO3
3) SO3 + H2SO4 => H2S2O7
4) H2S2O7 + H2O => 2H2SO4

Question 2

Step 2) 2SO2 +O2 <=> 2SO3

Answer 2

Exothermic

3 moles at start and 2 at end so use low pressure of 2 atmospheres to increase product yield

Max yield lower temp but slows rate down so use 450 degrees Celsius with catalyst

Catalyst : vanadium(V) Oxide V2O5

99 % product yield

Question 3

Uses of sulfuric acid

Answer 3

Fertilisers mostly phosphate fertilisers

Detergents - cleaning

Making pigments in paints