## Chemistry and Chemical Reactivity (9th Edition)

a) Weight percent: $1130/(1130+7250)\times 100\%=13.5\%$ Number of moles of NaCl: $1130\ g\div 58.44\ g/mol=19.35\ mol$ Number of moles of water: $7250\ g\div 18.015\ g/mol=402.44\ mol$ b) Mole fraction: $19.35/(19.35+402.44)=0.046$ c) Molality: $19.35\ mol/(7250/1000)kg=2.67\ m$