A sample of carbon monoxide gas was collected in a 2.0 L flask by displacing water at 28°C and 810 mmHg.Calculate the number of CO molecules in the flask.The vapor pressure of water at 28°C is 28.3 mmHg. A)5.0 × 10²² B)5.2 × 10²² C)3.8 × 10²³ D)5.4 × 10²³ E)3.8 × 10²⁵

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The partial pressure of CO is 810 mmHg - 28.3 mmHg = 781.7 mmHg.The number of moles of CO is (781.7 mmHg / 760 mmHg/atm) * (2.0 L) / (0.0821 L*atm/mol*K) * (28 + 273) K = 0.038 mol.The number of CO molecules is 0.038 mol * (6.022 * 10^23 molecules/mol) = 2.29 * 10^22 molecules.

A Sample of Carbon Monoxide Gas Was Collected in a 2.0