StoichiometryGas Volume and Mole Concept21Choose 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
StoichiometryMass–Mole Conversion22Choose the best answerHow many moles of Na are present in 0.1 g Na?A4.3 × 10⁻³ molB4.01 × 10⁻² molC4.03 × 10⁻¹ molD4.3 × 10⁻² mol Like 0 Discuss 0Share
StoichiometryAvogadro's Law and Gas Volume23Choose the best answerA stoichiometric mass–volume calculation for gases mainly connects moles with gas volume through:ALaw of definite compositionBGay-Lussac's law onlyCAvogadro's lawDLaw of multiple proportions Like 0 Discuss 0Share
StoichiometryMass–Mole Conversion24Choose the best answerHow many moles are present in 45 g glucose, C₆H₁₂O₆?A1.0 molB0.50 molC0.25 molD0.125 mol Like 0 Discuss 0Share
StoichiometryStoichiometric Principles25Choose the best answerSelect the correct statements: I. 12 g O₂ can completely react with 13.5 g Al to form Al₂O₃. II. Under ideal stoichiometric conditions, actual yield does not exceed theoretical yield. III. 1 mol C₃H₈ and 1 mol C₃H₄ each produce 3 mol CO₂ on complete combustion. IV. 1 g S combines with 1 g O₂ to produce 1 g SO₂.AI, II, III and IVBII, III and IVCI, II and IIIDI, III and IV Like 0 Discuss 0Share