StoichiometryGas Volume and Mole Concept1Choose the best answerAir contains approximately 21% O₂ by volume. How many moles of O₂ are present in 10 L air at STP (273 K and 1 atm)?A2.1 molB0.21 molC0.016 molD0.094 mol Like 0 Discuss 0Share