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(3) Calculate the pressure, in torr, exerted by the collected O2 at the water temperature


A student performed the experiment described in this module, using 4.00 mL of a 3.5% H2O2 solution with a density of 1.61g mL-1. The water temperature was 25℃, and the barometric pressure in the laboratory was 30.40 in. Hq. After the student immersed the yeast in the peroxide solution, she collected 79.20 mL of O2 


(3) Calculate the pressure, in torr, exerted by the collected O2 at the water temperature

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Answer #1

pressure exerted by O2 = 748.36 torr

Explanation

barometric pressure = 30.40 in Hg

barometric pressure = 30.40 in Hg * (25.4 torr / 1 in Hg)

barometric pressure = 772.16 torr

vapor pressure of water at 25 oC = 23.8 torr

pressure exerted by O2 = (barometric pressure) - (vapor pressure of water at 25 oC)

pressure exerted by O2 = (772.16 torr) - (23.8 torr)

pressure exerted by O2 = 748.36 torr

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