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Number of water molecules in the drop of...

Number of water molecules in the drop of water, if 1 mL of water has 20 drops and A is Avogadro's number, is

A

0.5 A/18

B

0.05 A

C

0.5 A

D

0.05 A/18

Text Solution

Verified by Experts

The correct Answer is:
D
1 drop of water `=1/20 mL = 1/20 g` `(d_(H_(2)O) = 1g mL^(-1))`
18 g of water = A molecules
`therefore 1/20 g` water `=A/18 xx 1/20 = (0.05)/18` A molecules.
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