Explanation:

The moles to liter conversion can be done using the relationship :

1 mol of a gas at STP occupies 22.4 L of volume , so if you have 3.2 moles of O2 it will occupy the volume calculated as follows:

3.2 moles of O2 x 22.4 L of O2 / 1 mole fo O2 = 71.7 L

Answer:

71.7 L

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