Advance Study Assignment SECTION would each of the following errors affect the o

Question

Advance Study Assignment SECTION would each of the following errors affect the outcome of this experiment? Would it make the molar mass high or low? Give your reasoning in three a) The flask was not quite cool when weighed. 1. How sentences or less in each case. b) Water vapors condensed under the aluminum foil before the final weighing. 2. A volatile liquid was allowed to evaporate in a 43.298-g flask that has a total volume of 252 ml . The temperature of the water bath was 100°C at the atmospheric pressure of 776 torr. The mass of the flask and condensed vapor was 44.173 g. Calculate the molar mass of the liquid.

Explanation / Answer

1.

You didn't provide sufficient experimental details, but here is some possible outcome:
a) The final mass would be slightly less than it should be so the calculated mass of the volatile liquid and the molar mass would be less.

b) If you were using water vapor in the flask it would not affect the result. If you were looking at something other than water the water would add to the final mass so the calculated mass of liquid and the molar mass would be more.

2.

moles of gas = PV / RT
                      = (776 torr) x (0.252 L) / [ (62.363 L torr mol-1 K-1) x (273 + 100) K]
                      = 0.00841 moles

Which have mass of 44.173 g - 43.298 g = 0.875 g

So, molar mass = (0.875 g) / (0.00841 moles) = 104.1 g/mole

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