Chemistry - Stoichiometry Question with Solution | TestHub

ChemistryStoichiometryBasic Methods of Calculations (POAC, LR)Medium2 minQB

ChemistryMediummultiple choice

12 g of Mg was burnt in a closed vessel containing 32 g oxygen. Which of the following is/are correct

Options:(select one or more)

Answer:

B, C, D

Solution:

The balanced chemical reaction is $2 M g + O_{2} \to 2 M g O$ . Starting with $0.5 m o l$ of $M g$ ( $12/24$ ) and $1 m o l$ of $O_{2}$ ( $32/32$ ), $M g$ acts as the limiting reagent. It reacts completely with $0.25 m o l$ of $O_{2}$ , leaving $0.75 m o l$ of $O_{2}$ unreacted (Option B). This produces $0.5 m o l$ of $M g O$ , which weighs $0.5 \times 40 = 20g$ (Option C). Finally, by the law of conservation of mass, the total mass of the mixture remains $12 + 32 = 44g$ (Option D).

Stream:JEESubject:ChemistryTopic:StoichiometrySubtopic:Basic Methods of Calculations (POAC, LR)

⏱ 2mℹ️ Source: QB

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