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Calculate the molality of KCl in the solution. Express your answer with the appropriate units. A piston has an external pressure of 12.0 atm. How much work has been done in joules if the cylinder goes from a volume of 0.140 liters to 0.490 liters? Express your answer with the appropriate units. J Part A Calculate the mass percent of KCl in the solution. Express your answer with the appropriate units. X Incorrect; Try Again; 4 attempts remaining Enter your answer using units of percent