Sodium and oxygen combine to form two compounds of which one is Na,0. The percentage of sodium in the other compound is 59%. Find the formula of this compound.
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The ratio of masses of sodium combining with the fixed mass of oxygen is 2.87 : 1.44 = 2:1. Therefore formula of the other compound is Na2O2.
explanation
Percentage of sodium in Na2O is
and percentage of oxygen is 25.8%. Percentage of sodium in other compound is 59% while that of oxygen is 41%. This means that in the first compound (Na2O) if we take 100 gm then 25.8 gm of oxygen will be present therefore the mass of sodium combining with 1 g of oxygen would be
Similarly in the second compound the mass of sodium combining with one gm of oxygen is 59/41 = 1.44 g. The ratio of masses of sodium combining with the fixed mass of oxygen is 2.87 : 1.44 = 2:1. Therefore formula of the other compound is Na2O2.
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