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The molality of the 3M solution of metha...

The molality of the 3M solution of methanol is the density of the solution is 0.9 `cm^(-3)` is

A

3.73

B

3

C

3.33

D

3.1

Text Solution

Verified by Experts

The correct Answer is:
A
`because molarity (C )=(w_(B)(%)xxdxx10)/(M_(B))`
and `Molality (m) =(W_(B)(%)xx1000)/(100-W_(B)(%)xxM_(B))`
`M_(B)` =moler mass of solute
`W_(B)`= mas of `CH_(3)` OH
=32(12+3+16+1)
and `m=(w_(B)(%)xx1000)/[(100-10.66]xx32)=(10.66xx12000)/(89.34xx32)`
`m=3.728=3.73` m
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