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Question

what mass would 13.2 liters of carbon dioxide gas have at STP?

Answer 1

At STP, 1 mole of any gas occupies 22.4 L. (13.2 L) * (1 mol gas / 22.4 L) = 0.589 moles. (0.589 mol CO₂) * (44.0g CO₂ / 1 mol CO₂) = 25.9g CO₂.