MCAT practice questions

by goldstandard_mcat (Posted Tue Nov 14, 2017 3:32 am) An anesthesiologist is preparing an anesthetic mixture at standard pressure and 25 oC which contains 564 torr N2O and 12.4 torr of the halogenated anesthetic halothane (CHClBrCF3). If the mixture contains only these two compounds and oxygen, what is the partial pressure of oxygen in the mixture at 25 oC?A. 124 torrB. 154 torrC. 184 torrD. 214 torrCorrect Answer: CExplanation: Standard pressure is 1 atm, 101.3 kPa or 760 mmHg or torr.Using Dalton's law [pp = partial pressure]:pp(N2O) + pp(halothane) + pp(O2) = 760564 + 12.4 + pp(O2) = 760pp(O2) = 183.6 = approx. 184 torrMCAT practice question from Gold Standard MCAT https://www.mcat-prep.com/
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