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What will be the value of molality for a...

What will be the value of molality for an aqueous solution of 10 % w/w NaOH ? (Na = 23, O = 16, H = 1)

A

`2.778`

B

5

C

10

D

`2.5`

Text Solution

Verified by Experts

The correct Answer is:
A
`m = ("mass of solute"xx1000)/("atomic weight" xx "mass of solvent")`
`= (10xx1000)/(40xx90)=2.778`
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A compound on analysis gave the following percentage composition: Na=14.31% S = 9.97%, H = 6.22%, O = 69.5%, calcualte the molecular formula of the compound on the assumption that all the hydrogen in the compound is present in combination with oxygen as water of crystallisation. Molecular mass of the compound is 322 [Na = 23, S = 32, H = 1, 0 = 16].

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