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Atomic Mass and Atomic Mass Unit

How many atom...

Question

How many atoms of calcium are present in 2g of calcium? (Atomic mass of $Ca$ = 40)

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Solution

No of moles of $Ca$ = $\frac{2}{40}$ = 0.05 moles
1 mole Ca atom = $6.022 \times 10^{23}$ $Ca$ atoms
Therefore, 0.05 moles of $Ca$ atom = 0.05 $\times$ $6.022 \times 10^{23}$ = $3.01 \times 10^{22}$ atoms.

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