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If 5.85g of NaClare dissolved in90g of w...

If `5.85`g of `NaCl`are dissolved in`90g` of water,the moles fraction of`NaCl` is

A

`0.1`

B

`0.3`

C

`0.01`

D

`0.0196`

Text Solution

Verified by Experts

The correct Answer is:
D
Molecular wt. of `NaCl= 58.5 `
5.85 gms of NaCl = 0.1mole
Molecular wt. of`H_(2)O =18`
90 gms of `H_(2)O = ` 5 mole
Mole fraction `= ( n_(NaCl))/(n_(NaCl)+n_(H_(2)O))=(0.1)/( 0.1+5) =( 0.1)/( 5.1 ) `
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