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JAMB Chemistry 2021 Paper

Question : 21

Total: 40

220g of carbon dioxide contains ----- moles

Solution:

Concept:

Number of moles is calculated by dividing the given mass by the molar mass of the compound.

Explanation:

Carbon dioxide,

\mathrm{CO}_2

, has a molar mass of:

12 + 2(16) = 44\,\mathrm{g/mol}

Then, number of moles

= \frac{\text{mass}}{\text{molar mass}}

= \frac{220\,\mathrm{g}}{44\,\mathrm{g/mol}} = 5\,\mathrm{moles}

Answer:

A. 5

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