Question

A compound h2x with molar weight of 80 gram is dissolved in solvent having density of 0.4 gm/ml assuming no change in volume up on dissolution the molarity of a 3.2 molar solution is ??

Answer 1

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This is already solved by me ;

This question can be solved by conversion of Molarity into molality

As we know that ,

Molarity = 3.2 M

let volume of solution = 1000ml = Volume of solvent

Mass of solvent = 1000 × 0.4 = 400 g

since, Molarity of solution = 3.2 molar

so, N(solute) = 3.2 mol

Molarity (m) =

$\frac{3.2}{ \frac{400}{1000} } = \frac{3.2 \times 1000}{400} = 8$

Hence, Correct integer by solving is 8

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Answer 2

✌️✌️ hey mate,

By conversion of Molarity into molality -

As we know that , 

Molarity = 3.2 M

let volume of solution = 1000ml = Volume of solvent 

Mass of solvent = 1000 × 0.4 = 400 g

since, Molarity of solution = 3.2 molar

so, N(solute) = 3.2 mol

Molarity (m) = 

3.2÷400/1000 = 3.2×1000/400=8

Hence, Correct integer by solving is 8 

thanks...
nice to help you ✌️✌️