At 298 K, 34.2 grams of sucrose is dissolved in 180 grams of water. Relative lowering of vapour pressure of solution will be

nsucrose=34.2342=0.1 ;                    nwater=18018=10 ;RLVP  of solution=X2mole fraction of solute;RLVP  of solution=0.10.1+10=1101;