The vapour pressure of an aqueous solution of sucrose
Asked by admin @ in Chemistry viewed by 499 People
The vapour pressure of an aqueous solution of sucrose at 373k is found to be 750mm hg. the molality at same temperature is
Asked by admin @ in Chemistry viewed by 499 People
The vapour pressure of an aqueous solution of sucrose at 373k is found to be 750mm hg. the molality at same temperature is
Answered by admin @
Given that
pressure at 373 of solution is 750 mm Hg.
Pressure of solvent means water at 373 K is 760 mmHg
According to the Raoult’s law;
Psoln = PH2O XH2O
750 = 760 (XH2O)
mole fraction; XH2O = 0.987
mole fraction = moles of water / total number of moles (water + solute )
Here mass of water is 1.00 kg or 1000 g
Therefore;
Number of moles = amount in g / molar mass
= 1000g 18.02 g/ mole= 55.6 moles H2O,
And from mole frcation;
0.987 = 55.6 /(55.6 + x)
x = moles glucose = 0.777 moles
and molality = moles solute / kg solvent, molality = 0.777 m
Asked by admin @ in Chemistry viewed by 327 persons
Asked by admin @ in Chemistry viewed by 497 persons
Asked by admin @ in Chemistry viewed by 290 persons
Asked by admin @ in Chemistry viewed by 330 persons
Asked by admin @ in Chemistry viewed by 307 persons
Asked by admin @ in Chemistry viewed by 336 persons
Asked by admin @ in Chemistry viewed by 279 persons
Asked by admin @ in Chemistry viewed by 344 persons
Asked by maham237 @ in Chemistry viewed by 322 persons
Asked by maham237 @ in Chemistry viewed by 438 persons
Asked by admin @ in Chemistry viewed by 401 persons
Asked by admin @ in Chemistry viewed by 282 persons
Asked by admin @ in Chemistry viewed by 345 persons
Asked by admin @ in Chemistry viewed by 259 persons
Asked by admin @ in Chemistry viewed by 311 persons
Asked by admin @ in Chemistry viewed by 2187 persons
Asked by admin @ in Chemistry viewed by 1926 persons
Asked by admin @ in Chemistry viewed by 1394 persons
Asked by maham237 @ in Chemistry viewed by 1321 persons
Asked by admin @ in Chemistry viewed by 1284 persons
Asked by maham237 @ in Chemistry viewed by 1250 persons
Asked by admin @ in Chemistry viewed by 1249 persons
Asked by maham237 @ in Chemistry viewed by 1222 persons
Asked by maham237 @ in Chemistry viewed by 1034 persons
Asked by admin @ in Chemistry viewed by 1008 persons
Asked by maham237 @ in Chemistry viewed by 985 persons