Question

What weight of glucose should be added to 1700 gm of water at 20C to lower its vapour pressure by t.001 mm 7 The vapour pressure of water at 20C 17mm​

Answer 1

Answer:

Explanation:

As the relative lowering of vapor pressure is directly proportional to the amount of dissolved solute.

The formula for relative lowering of vapor pressure will be,

where,

= lowering of vapor pressure = 0.001 mmHg

= vapor pressure of solvent  = 17 mmHg

= mass of solute  (glucose) = x g

= mass of solvent  = 1700 g

= molar mass of solvent (water) = 18 g/mole

= molar mass of solute (glucose) = 180 g/mole

Now put all the given values in this formula ,we get the vapor pressure of the solution.

Therefore, the weight of glucose that would have to be be added to 1700g of water is 1 gram.