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Q.

The water at 277 K is 18 ml. One ml of water contains 20 drops. The number of molecules in one drop of water will be : volume of one mole of

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a

$1.67 \times 10^{21}$

b

$1.07 \times 10^{21}$

c

$1.67 \times 10^{20}$

d

$2.67 \times 10^{21}$

answer is B.

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Detailed Solution

The number of molecule in one drop of water,

$\frac{1}{20} \times \frac{1}{18} \times 6 \times 10^{28} = 1.67 \times 10^{21}$

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