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No. of H(2)O molecules in a drop of wate...

No. of `H_(2)O` molecules in a drop of water weighing 0.05 g is :

A

`1.15 xx 10^(23)`

B

`1.672 xx 10^(21)`

C

`1.5 xx 10^(20)`

D

`6.022 xx 10^(22)`

Text Solution

Verified by Experts

The correct Answer is:
B
18.0 g of `H_(2)O` contain molecules
`=6.022 xx 10^(23)`
0.05 g of `H_(2)O` contain molecules
`= ((0.05g))/((18.0g))xx6.022xx10^(23)`
`=1.673xx10^(21)` molecules.
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