Ex. 3: Sodium and oxygen combine to form two compounds of which one is Na2O. The percentage of sodium in the other compound is 59%. Find the formula of this compound.

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( 4-1.080 times 49 operatorname{en} i 8(100-74 cdot 2) ) [ =25 cdot 81 ] given ( y cdot eta_{f} ) tha in opher compound is 59 ( & quad 0 times 4 g operatorname{en} i & rightarrow 1-1 ) ( 1^{text {st }} ) compound: In loo gis? 5.8 Joungen present ( therefore ) rorss of sodium cosss bining with 1 g If oxygen would be ( frac{74 cdot 2}{25 cdot 8}=2 cdot 87 g ) Similariy 2 not cosnpongle roass in Ma cuson sining wid 1 g of oxygen will be ( frac{59}{41}=1.44 mathrm{g} ) The ratio of rovisses of solium cosol bin ing with fixed rarss of ormgen [ text { is } 2 cdot 87: 1 cdot 44=2 ; 1 ] o. Formula of IInd coonfound is ( N a_{2} O_{2} )

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