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45)Caffine has a molecular weight of 194. It contains28.9% by mass of nitrogen Number of atoms ofnitrogen in one molecule of it -(2) 3(4) 5(3) 4

Answer»

Molar mass of caffeine = 194u

N present in one molecule of caffeine = 28.9 % of 194 = 28.9/100 x 194 = 56u

Mass of one N atom = 14u

Hence 14u = 1N atom

56u = 56/14 N atom = 4N atom



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