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At STP (Standard Temperature and Pressure: 0°C and 1 atm pressure), 1 mole of any gas occupies 22.4 L. Therefore, to find the number of moles of O gas in 10.0 L at STP, we divide 10.0 by 22.4 to get 0.4464 moles. The molar mass of oxygen (O₂) is 32 g/mol, so 0.4464 moles of O₂ gas would be 0.4464 moles * 32 g/mol ≈ 14.3 grams.

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Q: How many grams of O gas occupy 10.0 L at STP?
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