## Chemistry and Chemical Reactivity (9th Edition)

Number of moles of calcium chloride: $0.739\ g\div 110.97\ g/mol=0.00666\ mol$ Number of moles of water: $(0.832-0.739)\ g\div 18.015\ g/mol=0.00516\ mol$ Ratio: $0.00666/0.00516=1.29$ Since this value is smaller than the actual value, there's still water in the sample.