3 moles of KClO4 produce from 4 moles of kclo3
3/4 moles o kclo4 produced from 1 mole of kclo3
again ,
1 mole of kclo3 produced from 3 moles kclo
1/4 moles of kclo4 produced from 1 mole of kclo
now,
1 mole of kclo produed from 1 mole of cl2
1/4 mole of kclo4 produced from 1 mole of cl2
1 mole of kclo4 produced from 4 mole of cl2
100 g produed from 4x100x71/138.5 g of cl2 =204.5 gm of cl2