dm³ or 3.5 liters. Knowing that at STP, a mole of each gas is 22.4 dm³:
Calculate molar mass of O₂: 2 × 16 g/mol = 32 g/mol.
Find the number of moles of O₂: 5 g / 32 g = 0.156 moles.
One mole is 22.4 dm³, so 0.156 moles will be 0.156 × 22.4 dm³ = 3.5 dm³.
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