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Common salt obtained from sea-water cont...

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

A

`10^(21)`

B

`10 ^(22)`

C

`10 ^(23)`

D

`10 ^(24)`

Text Solution

Verified by Experts

The correct Answer is:
C
Mass of NaCl of 10 g salt `= 10 xx (95 )/(100) = 9. 5 g `
Number of molecules of `NaCl = ( 9. 5)/(58.5) xx 6. 02 xx 10 ^(23) = 0. 978 xx 10 ^(23) ~~10^(23)`
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