CHEMISTRY 121L MOLAR VOLUME OF OXYGEN QUESTIONS . Indicate how each of the follo

Question

CHEMISTRY 121L MOLAR VOLUME OF OXYGEN QUESTIONS . Indicate how each of the following errors would affect (increase, decrease, or no change) your calculated value for the molar volume of O, at STP (assuming that you complete the experiment otherwise correctly). In each case, exp answer. lain your You forgot to subtract the vapor pressure of water in determining the pressure of O a. While heating your sample in the test tube, your flame was improperly ad- justed so that a black soot formed on the outside of the test tube and was not removed before being weighed. b.

Explanation / Answer

Q1

a)

If

Ptotal = Pgas + Pvapor

Pgas = Ptotal P vapor

then, Pgas > Preal

which implies more moles of gas

if more moles --> v = V/n

the molar volume DECREASES

b

this is burning of material, some CO2 could have been formed, therefore there are more gases than only O2 gas

therefore, moles decrease since Volume will be incorrectly stated

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