J) 20.21U 41. A compound has 20% of...
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J) 20.21U 41. A compound has 20% of nitrogen by weight. If one molecule of the compound contains two nitrogen atoms, the molecular weight of the compound is 1) 35 2) 70 3) 140 4) 280

JEE/Engineering Exams
Chemistry
Solution
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Let the total weight of the compound be ( mathrm{X} ) Then ( 20 % ) of ( X ) will be the weight of 2 nitrogen atoms = ( frac{20}{100} times X=14 times 2 ) ( x=14 times 2 times frac{100}{20} ) ( x=140 mathrm{gm} )
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