Question

The mole fraction of water in a solution of hcl is 0.78. calculate the molality.

Answer 1

Answer:

molarity is 0.0000364

Answer 2

Molality of solution is 16 mole/kg

Explanation:

Molality of a solution is defined as the number of moles of solute dissolved per kg of the solvent.

$Molarity=\frac{n}{W_s}$

where,

n = moles of solute

$W_s$ = weight of solvent in kg

moles of water (solvent )= 0.78

moles of HCl (solute) = (1-0.78) =0.22  

mass of water (solvent )= $moles\times {\text {Molar Mass}}=0.78\times 18=14g=0.014kg$

Now put all the given values in the formula of molality, we get

$Molality=\frac{0.22}{0.014kg}=16mole/kg$

Therefore, the molality of solution is 16 mole/kg

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