## Chemistry and Chemical Reactivity (9th Edition)

$17.64\ mmHg$
Number of moles of urea: $9.0\ g\div 60.06\ g/mol=0.15\ mol$ Number of moles of water: $10\ mL\times 1.0\ g/mL\div 18.015\ g/mol=0.555\ mol$ Mole fraction of solvent: $0.555/(0.555+0.15)=0.787$ Vapor pressure of water: $P=XP^0=0.787\times 22.4\ mmHg=17.64\ mmHg$