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Mole Concept & Avogadro Number

Calculate the...

Question

Calculate the number of moles in 2.2g of ${CO}_{2}$ .

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Solution

Given mass = 2.2g
Molecular weight of carbon dioxide (CO₂) = $12 + (2 \times 16)$ = 44 u
Gram molecular mass of ${CO}_{2}$ , M= 44 g
No. of moles, n = $\frac{w}{M}$ = $\frac{2.2}{44}$ = 0.05 moles
Therefore, the number of moles in 2.2g of ${CO}_{2}$ is 0.05 moles.

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