Indicate how each of the following erros would affect (increase, decrease, or no
ID: 589736 • Letter: I
Question
Indicate how each of the following erros would affect (increase, decrease, or no change) your calculated value for the molar volume of O2 at STP.
Please help!
MOLAR VOL U ME OF o QUESTIONS 1. Indicate how each of the followving 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, explain your answer. You forgot to subtract the vapor pressure of water in determining the pressure a. of O 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
a)
if Vapor pressuer was not siubstracted
P-O2 = is higher than it should be
then
PV = nRt
V/n = RT/P
V/n increases, mainly becaus eof the moles calculation is relate dincorrectly, moles of O2 will be less
then the molar volume decreases
b)
if black soot is formed, there is carbonization, that is, there is extra matter converted to solid, therefore not enough gas wil be present
then
Vmolar decreases