For each of the situations below, indicate whether the formulaweight calculated
ID: 1758959 • Letter: F
Question
For each of the situations below, indicate whether the formulaweight calculated from the ideal gas law would be higher than,lower than, or the same as the true formula weight of the organiccompound. Give your reasoning in each case.a. The temperature of the boiling water is actually lower than thatrecorded.
b. The barometric pressure in the laboratory is actually higherthan that recorded.
c. Not all of the liquid has vaporized when the flask is removedfrom the boiling water bath.
Explanation / Answer
PV = nRT a) T is higher => n = PV/(RT). n islarger than it actually calculated So you have underestimated the number of moles. MW =mass/number of moles. Calculated MW is higher than true value. b) n = PV/(RT). n is smaller than what is actuallycalculated Calculated MW is smaller than true value c) You have accurately measured P, T, V (it is not given you canmeasure these incorrectly). So you will calculate the correctnumber of moles. You will get the true formula weight
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