4. A compound contains 3.2% of oxyg...
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4. A compound contains 3.2% of oxygen by mass. The minimum molecular weight of the compound is (2) 440 (1) 300 (3) 350 (4) 500

IIT/JEE
Chemistry
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( 3 cdot 2 mathrm{gm} mathrm{O}_{2} ) in 100 gm compound Molar Atomic mass of ( 0=16 mathrm{gm} ) Minimum amount of 0 that can be present in compound ( =16 mathrm{gm} ) (1 mole) is ( 3.2 mathrm{gm} rightarrow 100 mathrm{pm} ) compound 16 gm ( rightarrow x ) ( x=frac{16 times 100}{320-2} ) Mivimum molecular= 500 gm weight of the compound
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