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Q.

What mass of the compound ${CrO}_{3} (M = 100.0)$ contains $4.5 \times 10^{23}$ oxygen atoms?

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a

25.0 g

b

12.0 g

c

75.0 g

d

2.25 g

answer is C.

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Detailed Solution

Here, the mass of the compound can be calculated as;

$\frac{W}{100} \times 3 \times 6 \times 10^{23} = 4.5 \times 10^{23}$

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