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Q.

Vanillin, $C_{8} H_{8} O_{3} (M = 152 g / mol)$ is the molecule responsible for the vanilla flavor in food. Ho· many oxygen atoms are present in a 45.0 mg sample of vanillin?

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a

$5.35 \times 10^{20}$

b

$1.78 \times 10^{20}$

c

$5.35 \times 10^{23}$

d

$1.78 \times 10^{28}$

answer is B.

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Detailed Solution

Number of $O_{2}$ atoms present;

$\frac{45 \times 10^{- 3}}{152} \times 3 \times 6 \times 10^{23}$

$5.35 \times 10^{20}$

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Vanillin, C8H8O3(M=152g/mol) is the molecule responsible for the vanilla flavor in food. Ho· many oxygen atoms are present in a 45.0 mg sample of vanillin?