contestada

A 175.3 mg sample of C10H12O2 was dissolved in 1.50 g of chloroform (Kb = 3.63 °C/m). What is the boiling point of this solution.

Respuesta :

Answer:

[tex]Tb=63.8\°C[/tex]

Explanation:

Hello,

In this case, for the boiling point elevation, we have:

[tex]\Delta T=i*m*Kb[/tex]

Whereas the van't Hoff factor for the given substance is 1 since is not ionizing.  Moreover, the molality is computed by:

[tex]m=\frac{mol_{solute}}{m_{solvent}}=\frac{175.3mg*\frac{1g}{1000mg}*\frac{1nol}{164g} }{1.50g*\frac{1kg}{1000g} } =0.713m[/tex]

In such a way, since the boiling point of pure chloroform is 61.2 °C, the boiling point of the solution is:

[tex]Tb=61.2\°C+1*0.713m*3.63\frac{\°C}{m} \\\\Tb=63.8\°C[/tex]

Regards.