Chemistry - Mole Concept Question with Solution | TestHub

ChemistryMole ConceptMiscellaneous/MixedEasy2 minPYQ_2015

ChemistryEasysingle choice

Caffeine has a molecular weight of $194 u$ . If it contains $28.9%$ by mass of nitrogen, number of atom of nitrogen in one molecule of caffeine is

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Solution:

M.wt. of caffeine $= 194 u$ $%$ of $N$ present in one molecular of caffeine is $28.9%$ of $194 u = \frac{28.9}{100} \times 194 = 56 u$ Mass of one $N$ atom $= 14 m$ $= 1 N$ atom $(∵ 14 m = 14 u)$ $∴ 56 u = \frac{56}{14} N$ atom $= 4 N$ atom

Stream:VITEEESubject:ChemistryTopic:Mole ConceptSubtopic:Miscellaneous/Mixed

⏱ 2mℹ️ Source: PYQ_2015

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