Chemistry - Mole Concept Question with Solution | TestHub

ChemistryMole ConceptMiscellaneous/MixedEasy2 minPYQ_2020

ChemistryEasysingle choice

$10 g$ of $M g C O_{3}$ decomposes on heating to $0.1$ mole $C O_{2}$ and $4 g M g O .$ The percent purity of $M g C O_{3}$ is
(Given that atomic weights of $Mg, C$ and $O$ are $24, 12$ and $16$ u)

Options:

Answer:

Solution:

$M g C O_{3}$ decomposes as below:

$M g C O_{3} \to M g O + C O_{2}$

mole ratio $= 1 : 1 : 1$

Thus $0.1$ mole of $C O_{2}$ will be produced by $0.1$ mole of $M g C O_{3} .$

Mass of $M g C O_{3}$ in $10 g$ sample $= 0.1 \times 84 = 8.4 g$

Percent purity $= \frac{8.4}{10} \times 100 = 84 %$

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

⏱ 2mℹ️ Source: PYQ_2020

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