Explain the 3 stages of the contact process
1. make sulfur dioxide by burning sulfur in air (S + O2 = SO2) 2. Sulfur dioxide is oxidised using a catalyst (2SO2 + O2 =2SO3) 3. Then the sulfur trioxide that is formed is dissolved in water to make sulfuric acid (SO3 + H2O =H2SO4)
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