Homework O HQ12.40 At what temperature does water boil if 75.0 gof glucose (180.

Question

Homework O HQ12.40 At what temperature does water boil if 75.0 gof glucose (180.1 g/mol) is added to 400 g of water? (Use Table 12.4) Molal Freezing Point and Boiling Point Constants Freczing9 Boiling K, Solvent Water Acetic acid Benzene Chloroform Ethanol Phenol Formulapoint (°C) (°C/molal) point (°C) (°C/molal) 1.86 3.90 4.90 4.68 1.99 7.40 0.0 CH,COOH 17.0 5.5 -63.5 C,H,OH -114.7 43.0 100.0 118.1 80.2 61.2 78.4 181.0 0.51 3.07 2.53 3.63 1.22 3.56 C H CHCI CH OH O A 100.25°C O B 100.53 C O C100.84°C O D 101.39°C

Explanation / Answer

DTb = i*kb*m

DTb = Tb-T0

T0 = boiling point of solvent(water) = 100 C

Tb = boiling point of solution = x C

m = molality of solution = (w/M)*(1000/ W in g)

   = (75/180.1)*(1000/400)

i = vanthaff factor of glucose = 1

kb of water = 0.51 °C/m

(x-100) = 1*0.512*(75/180.1)*(1000/400)

boiling point of solution = 100.533 c

answer: B

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