# Halothane, C2HBrClF3, is a nonflammable, nonexplosive, and nonirritating gas that is commonly used as an inhalation anesthetic. The total pressure of a mixture of 15.0 g of halothane vapor and 24.5 g of oxygen gas is 845 mm Hg. What is the partial pressure of each gas?

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Halothane, C2HBrClF3, is a nonflammable, nonexplosive, and nonirritating gas that is commonly used as an inhalation anesthetic. The total pressure of a mixture of 15.0 g of halothane vapor and 24.5 g of oxygen gas is 845 mm Hg. What is the partial pressure of each gas?

Phalothane = mm Hg

Poxygen = mm Hg

No of mol of Halothane = w/Mwt = 15/197.4 = 0.076 mol

No of mol of O2 = 24.5/32 = 0.766 mol

total no of mol of mixture = 0.766+0.076 = 0.842 mol

molefraction of Halothane = 0.076/0.842 = 0.09

molefraction of O2 = 0.766/0.842 = 0.91

according to daltons law of partial pressures

partial pressure of O2(pO2) = Xo2*ptotal

= 0.91*845

= 769 mmhg

partial pressure of Halothane = Xhalothane*ptotal

= 0.09*845

= 76.05 mmhg