The molar volume of any ideal gas at STP condition is 22.4 L
3.20 mol x 22.4L / 1 mol = 71.68 L = 71.7 L
The answer to the question asked above is that in a Molecular Solid, the substance just dissolves into the solution when added to water but ionic solid does not.
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1 mole O2 -------------------- 6,02.10²³ molecules
0,25 mole O2 ---------------- x molecules
1 . x = 0,25 . 6,02.10²³
x = 1,50.10²³ molecules
To test this, you'd need to see if a reaction is still taking place, If the enzyme is completely depleted, then the reaction could no longer occur.