Q.

sixteen gram of methanol is present in hundred mililitre of the solution. If the density of the solution is zero point ninty six gram per mililitre. Then, the molality of the solution is

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a

6.25m

b

5.75m

c

5m

d

5.20m

answer is A.

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Detailed Solution

Weight of methanol , w=16g

Volume of solution, V=100mL

Density of solution , d=0.96g/mL

So, weight of solution W = d×V

                                          W = 0.96×100=96g

Wsolvent=Totalmassofsolution massof solute

    Wsolvent=9616=80g

Molar mass of methanol, GMW=32g/mol

Then , molality of solution,

   m=wGMW×1000weightof solvent in grams

Therefore, molality=1632×100080=6.25m   

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