Respuesta :
molarity =Number of moles of compound*1000/(mass of solvent)
Number of moles of NaCl=Given mass/molar mass
Given mass of NaCl=14.3 g
molar mass of NaCl=58.44g
Number of moles of NaCl= 14.3/58.44
=0.244
Mass of solvent (Water)=42.2 g
Molarity=0.244*1000/(42.2)
= 5.80m
Answer: e) 5.80 m
Explanation:
Molality : It is defined as the number of moles of solute present per kg of solvent
Formula used :
[tex]Molarity=\frac{n\times 1000}{W_s}[/tex]
where,
n= moles of solute
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}=\frac{14.3g}{58.5}=0.24moles[/tex]
[tex]W_s[/tex] = weight of solvent in g= 42.2 g
Now put all the given values in the formula of molarity, we get
[tex]Molarity=\frac{0.24moles\times 1000}{42.2g}=5.80mole/kg[/tex]
Therefore, the molality of solution will be 5.80 m
