Q.

If 1 mL of H2O contains 20 drops, then no. of molecules in a drop of water are

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a

6.023×1023

b

1.376×1026

c

1.673×1021

d

4.346 x 1020

answer is C.

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Detailed Solution

Volume of 20 drops = 1ml⇒ Volume of 1 drop= 120ml Mass of water = 120g [since density= 1g/cm3]∴ Moles of water =120×118​= 0.0518∴ Number of molecules = 0.0518NA=0.0518×6.023×1023= 1.673×1021 molecules
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