Ferric sulphate on heating gives sulphur trioxide

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Problem

Ferric sulphate on heating gives sulphur trioxide. The ratio between the weights of oxygen and sulphur present in

SO_3

obtained by heating 1 kg of ferric sulphate is 2 : 3 1 : 3 3 : 1 3 : 2 (1) 2 : 3 (2) 1 : 3 (3) 3 : 1 (4) 3 : 2