Show your work with good use of units, rounding, and significant figures. [Hint: it is good practice to show the value of your answer before you round off to the final answer with the correct significant figures!] (7 points) A solution was prepared by dissolving 18.00 g of glucose in 150.0 g of water. The molar mass of glucose is 180.15 g/mol. The boiling point elevation constant for water is 0.512 °C•kg/mol.

What is the molality of the solution?
What is the resulting solution's new boiling point?

Boiling point of a solution is found to be 100.34  

o

C. Boiling point of pure

water is 100  

o

C.      

The elevation in the boiling point ΔT  

b

=100.34−100=0.34  

o

C.

12 gm glucose (molecular weight 180 g/mol) is dissolved in 100 gm water.

The number of moles of  glucose =  

180g/mol

12g

=0.0667mol

Mass of water =100g×  

1000g

1kg

=0.100kg

Molality of solution m=  

0.100kg

0.0667mol

=0.667mol/kg

The elevation in the boiling point ΔT  

b

=K  

b

×m

0.34  

o

C=K  

b

×0.667mol/kg

K  

b

=0.51  

o

Ckg/mol

The molal elevation constant for water is 0.51  

o

Ckg/mol.

Explanation:

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