Enter your answer in the provided box. You analyze a sample of volatile liquid p

Question

Enter your answer in the provided box.

You analyze a sample of volatile liquid propyl acetate (C5H10O2) by placing a small volume of it in a round-bottomed flask with a volume of 516.0 mL and an evacuated mass of 131.418 g. You submerge the flask in a water bath at 100.0°C and allow the volatile liquid to vaporize. You then cap the flask and remove it from the water bath. What will the mass of the 516.0mL flask be after evaporation of the propyl acetate? (Assume the pressure in the laboratory is 1.000 atm.)

_____g

Explanation / Answer

volume of flask = 516.0 mL

volume of gaseous propyl acetate = 516.0 mL

pressure = 1.00 atm

temperature = 100oC = 373 K

P V = n R T

1 x 0.516 = n x 0.0821 x 373

n = 0.01685

moles = 0.01685

mass of propyl acetate = 0.01685 x 102.13

                                      = 1.72 g

mass of flask = 131.418 + 1.72 = 136.139 g

mass of flask = 136.139 g

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