Question

Caffine has a molecular weight 194.It contains 28.9%by mass of nitrogen.What is the number of atoms of nitrogen in one molecule of it?​

Answer 1

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Answer 2

Answer:

Molar mass of caffeine = 194u

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

mass of 1 N atom = 14 u

14u= 1 N atom

56u = 56÷14 = 4 N atom

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