The Total solution for NCERT class 6-12
Boiling point of water at 750 mmHg is 99.63┬░C. How much sucrose is to be added to 500 g of water such that itboils at 100┬░C.┬аMolal elevation constant for water is 0.52 K kg molтИТ1.
Here, elevation of boiling point╬ФTb┬а= (100 + 273) тИТ (99.63 + 273)
= 0.37 K
Mass of water,┬аwl┬а=500 g
Molar mass of sucrose (C12H22O11),┬аM2┬а=11 ├Ч 12 + 22 ├Ч 1 + 11 ├Ч 16
= 342 g molтИТ1
Molal elevation constant,┬аKb┬а=0.52 K kg molтИТ1
We know that: