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Chemistry - Mole Concept Question with Solution | TestHub

ChemistryMole ConceptMiscellaneous/MixedEasy2 minPYQ_2020

ChemistryEasysingle choice

A gaseous alkane on complete combustion gives $C O_{2} a n d H_{2} O$ . If the ratio of moles of $O_{2}$ needed for combustion and moles of $C O_{2}$ formed is $5 : 3 .$ find out the formula of alkane.

Options:

Answer:

Solution:

Let the alkane be $C_{n} H_{2 n + 2}$

$C_{n} H_{2 n + 2} + [n + \frac{n + 1}{2}] O_{2} \to n C O_{2} + (n + 1) H_{2} O$

$\frac{M o l e o f O_{2}}{M o l e o f C O_{2}} = \frac{n + \frac{n + 1}{2}}{n} = \frac{5}{3}$

$n = 3$

Thus the alkane is $C_{3} H_{8}$

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

⏱ 2mℹ️ Source: PYQ_2020

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