Common salt obtained from sea-water contains 95% NaCl by mass. The approximate number of molecules present in 10g salt is:

Options

A. `10^(21)`
B. `10^(22)`
C. `10^(23)`
D. `10^(24)`

Answer

C

Explanation

Mass of NaCl in 10g salt`=10xx(95)/(100)=9.5g`
Number of molecules of `NaCl=(9.5)/(58.5)xx6.023xx10^(23)`
`=9.78xx10^(22)=10^(23)`