Question #306002

B.Calculate the boiling point and freezing point of the following solutions:

1.0.575 molal aqueous solution

2.10 g of C6 H12 O6 dissolved in 259 g of water

3.0.5 mole Br2 dissolved in 507 g chloroform


D.A solution of propylene glycol (antifreeze) in the car’s radiator has a freezing point of -20 degree celcius.What is the molarity of the solution?


E.The boiling point of an aqueous solution is 102.5 degree celcius. What is the freezing point of the solution?

 


1
Expert's answer
2022-03-07T13:47:01-0500

B.

Taking kbk_b for water =0.515°C/M=0.515°C/M

and kfk_f for water =1.86°C/M=1.86°C/M


1.

ΔTb=0.515×0.575=0.30\Delta\>T_b=0.515×0.575=0.30

Boiling point =100+0.3=100.3°C=100+0.3=100.3°C


ΔTf=1.86×0.575=1.1\Delta\>T_f=1.86×0.575=1.1

Freezing point =01.1=1.1°C=0-1.1=-1.1°C


2.

Molar mass of C6H12O6 =180g/mol=180g/mol


Concentration =1000259×10180=0.2145M=\frac{1000}{259}×\frac{10}{180}=0.2145M



ΔTb=0.2145×1.86=0.40\Delta\>T_b=0.2145×1.86=0.40

Freezing point =00.40=0.40=0-0.40=-0.40





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