Number of molecules in 1 L of water is close to

Options

A. `18/(22.4 )xx10^(23)`
B. `55.5 xx 6 . 023 xx10^(23)`
C. `(6.023)/23.4 xx 10^(23)`
D. `18xx 6. 023 xx 10^(23)`

Answer

B

Explanation

1 mole of water means 18 g of water which means
`6.023xx 10^(23)` molecules.
1 L of water means = 1000 g
1000 g of water `= 1000/18 ` mol
As 1mol of water `= 6. 02 xx10^(23)` molecules
`therefore 1000/18` mol of water ` = 1000/18 xx 6.023xx 10^(23)`
` = 55.5 xx 6.023 xx 10^(23)`