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What is the molality of a 10% W/W aque...

What is the molality of a` 10% ` W/W aqueous sodium hydroxide solution?

A

`2.778`

B

`2.5`

C

`10`

D

`0.4`

Text Solution

Verified by Experts

The correct Answer is:
B
`10% (w)/(w)` aqueous NaOH solution means that 10g of sodium hydroxide in 100g solution.
Molality `= ("No. of moles of solute")/("Weight of solvent (in kg)")= (((10)/(40)))/(0.1)= (0.25)/(0.1) = 2.5 M`
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