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Q.

Calculate the number of oxygen atoms and its weight in 50 gm of ${CaCO}_{3}$ .

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a

$9.033 \times 10^{23}$ and $12 gm$

b

$9.033 \times 10^{23}$ and $24 gm$

c

$6.02 \times 10^{23}$ and $12 gm$

d

$6.02 \times 10^{23}$ and $24 gm$

answer is B.

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Detailed Solution

Number of oxygen atom,

$\frac{50}{100} \times 3 \times 6.023 \times 10^{23} = 9.033 x 10^{23}$

Weight,

$\frac{50}{100} \times 3 \times 16 = 24 gm$ .

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