StoichiometryPercentage Yield46Choose the best answerWhen 80 g CaCO₃ decomposes, the actual yield of CO₂ is 30 g. What is the percentage yield? CaCO₃ → CaO + CO₂A50%B60%C75%D85% Like 0 Discuss 0Share
BasicsStoichiometry #Molecular Mass47Choose the best answerWhich substance has numerically equal molecular mass and formula mass?ACaCO₃BMgOCNH₃DCaCO₃ and MgO Like 0 Discuss 0Share
StoichiometryMole–Mole Stoichiometry48Choose the best answerHow many moles of O₂ are produced by electrolysis of 108 g H₂O? 2H₂O → 2H₂ + O₂A2.5 molB3 molC6 molD7.5 mol Like 0 Discuss 0Share
StoichiometryGas Volume and Mole Concept49Choose 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
StoichiometryMole Concept and Number of Molecules50Choose the best answerWhich sample contains the largest number of molecules?A3.6 g H₂OB2.8 g COC4.8 g C₂H₅OHD5.4 g N₂O₅ Like 0 Discuss 0Share