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Q.

How many atoms are in $4.0 \times 10^{- 5}$ grams of Al?

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a

$2.4 \times 10^{19}$

b

$8.9 \times 10^{17}$

c

$6.5 \times 10^{20}$

d

$2.0 \times 10^{22}$

answer is A.

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Detailed Solution

Total number of required atom;

$\frac{4 \times 10^{- 5}}{27} \times 6.02 \times 10^{23}$

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How many atoms are in 4.0×10−5 grams of Al?