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Avogadro's Number

An atom of ma...

Question

An atom of magnesium weighs 3.98 * 10^-23 g. Calculate the number of atoms in 12 g of magnesium.

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Solution

An atom of magnesium contains = 6.022 $\times$ 10²³ atoms
3.98 $\times$ 10^-23 g of magnesium contains = 1 atom of magnesium
12 g of magnesium contains = $\frac{1}{3.98 \times 10^{- 23}} \times 12$ = 3.01 $\times$ 10²³ atoms of magnesium

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