Suppose that a student doing this experiment ran into some procedural and calcul

Question

Suppose that a student doing this experiment ran into some procedural and calculation difficulties. State the effect each of the following would have on the molar volume of O_2 determined from this experiment. Briefly explain. (1) The student neglected to take into account the pressure of water vapor in the system when doing the calculations. (2) The H_2 O_2 solution had decomposed slightly after standing a while, so its concentration was somewhat lower than the laboratory instructor had reported. (3) The student failed to read the barometric pressure at the time of the experiment. When she read the pressure the next day for use in her calculations, it was 0.50 in. Hg lower than it had been during the experiment.

Explanation / Answer

(1)

This would result in an excessively large molar volume than the actual.

(2)

Oxygen actually produced would be less than the one reported theoretically.

(3)

No effect, since we are only concerned with the change in pressure, and not the actual values.

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