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
EXPERT ANSWER
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