When a spontaneous process is in the course of an energy increase, then an oversized entropy increase must also occur.
A spontaneous process in the midst of an entropy decrease must even be amid an energy decrease. The reaction below doesn't progress at temperature but does at 1100C.
Doubling the amount of the reaction vessel and adding more oxygen to the reaction vessel will change the concentrations and can affect equilibrium concentrations.
So in this case, to urge the most percentage conversion to sulfur trioxide you'd choose an air mass.
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