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Q.

An aqueous solution of glucose boils at 100.01∘C. The molal elevation constant for water is 0.5 K mol-1 kg. The number of glucose molecules in the solution containing 100g water are _____x  1021

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Detailed Solution

 ∵    ΔT=1000Kb1wmW
0.01=1000×0.5×w180×100⇒∴  w=0.36g
∵180 g glucose contains  6.023×1023 molecules 
∴ 0.36g glucose contains  =6.023×1023×0.36180=1.2×1021  molecules 
 

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