1. Consider the ideal gas law equation used to calculate the moles of H2 (#7 abo
ID: 873271 • Letter: 1
Question
1. Consider the ideal gas law equation used to calculate the moles of H2 (#7 above):
PV = nRT n = PV/RT
Referring back to this equation, explain what effect (increase, decrease, no change) the following procedural errors had on the value of n (moles of H2)
a)The Mg did not react completely because a small piece floated out of the tube.
b)The pressure of the hydrogen gas was recorded without subtracting the vapor pressure of water.
c)Some of the water in the tube was allowed to leak out through the hole in the stopper before measuring the volume.
d)Comment on possible experimental errors.
Explanation / Answer
I guess is about reaction of Mg with H2O.
a) Less moles of H2 is produced.
b) Then real n value is smaller than predicted.
c) How much water were at the beggining how big is the proportion H2O:Mg?, this is an experimental question and it depends of your experiment. Supposing that a considerable amount of water reacted to make a change in the volume, then leaking the water before measuring the volume makes "n" bigger than it really is.
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