Problem

The vapor pressure of water at 100.0ºC is 0.720 atm. Determine the mass percent of iron (II) chloride, FeCl_{2}, needed to reduce its vapor pressure to 0.655 atm. (MW of FeCl_{2} is 126.756 g/mol)

A

67.7%

B

18.9%

C

22.5%

D

58.3%

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