The density of 20% (w/w) aqueous NaOH so...

The density of 20% (w/w) aqueous NaOH solution is 1.20 g.`mL^(-1)`. What is the mole fraction of water ? (molar mass of NaOH = 40g. `"mol"^(-1)` )

0.95

`0.90`

0.97

0.94

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