The number of meutrons in a drop water `(20 drops =1 mL)` at `4^(@)C`

Options

A. (a)`6.023xx10^(22)`
B. (b)`1.338xx10^(22)`
C. (c )`6.023xx10^(20)`
D. (d)`7.338xx10^(22)`

Answer

b

Explanation

Mass of a drop of water `=0.05xx1 g =0.05 g`
Number of moles of water `=0.05/18`
Number of water molecules `=0.05/18xx6.023xx10^(23)`
1 water molecule certain 8 neutrons
`:. .05/18xx6.023xx10^(23)` molecule contain
`(0.05xx8)/18xx6.023xx10^(23)` neutrons
`=0.1338xx10^(23)`
`=1.338xx10^(22)`