4 g of hydrogen reacts with 20 g of oxygen to form water the mass of water formed is
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2H2O + O2 ------ > 2H2O i.e 4g + 32g ----- > 36g
32grams of O2 gives 36grams of H2O.
20grams =?
= 36/32 * 20
= 22.5g.
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