173.3 g of NaCl completely dissolves (producting NA+ and Cl- ions) in 1.00 kg of water at 25.0 degrees celcius. the vapor pressure of pure water at this temperature is 23.8 torr. Determine the vapor pressure of the solution. A)19.3 torr B)23.8 torr C)21.5 torr D)22.6 torr E)20.0