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Analysis of chlorophyll shows that is containing 2.68 percent magnesium. How many atoms of magnesium does 1.00g of chlorophyll contain?

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$1.1 \times 10^{- 6} atoms$

$1.1 \times 10^{- 3} atoms$

$6.72 \times 10^{23} atoms$

$6.72 \times 10^{20} atoms$

answer is C.

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Detailed Solution

100g of chlorophyll has =2.68g of Mg

$1 g of chlorophyll has = \frac{1.00 \times 2.68}{100} g of M g$

$\begin{array}{l} = \frac{1.00 \times 2.68}{100} \times \frac{1}{24} m o l of mg \\ = \frac{2.68}{2400} \times 6.02 \times 10^{23} atoms of mg \\ = 6.72 \times 10^{20} atoms \end{array}$

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