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Q.

18 g of glucose C6H12O6 ( molar mass 180 gmol is dissolved in 1 kg of water in a sauce pan. The temperature at which water will boil (1.013 bar pressure) Kb for water =0.52 K kg mol will be

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a

200.202 K

b

373.052 K

c

373.202 K

d

100C

answer is B.

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Detailed Solution

Weight of solute, W2=18 g 

Wt. of solvent, W1=1 kg

mol.wt.=180 g mol- and Kb=0.52 K kg mol 

It is known as:

ΔTb=Kb×W2 in gM2×W1 in kg      =0.52 K kg mol×18 g180 g mol×1 kg=0.052 KT-T=TbT-373 K=0.052 KT=373 K+0.052 K=373.052K

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18 g of glucose C6H12O6 ( molar mass 180 gmol−)  is dissolved in 1 kg of water in a sauce pan. The temperature at which water will boil (1.013 bar pressure) Kb for water =0.52 K kg mol− will be