UHS MDCAT 2025 Chemistryuhs mdcat chemistry 2025#Percentage Yield#Stoichiometry51Choose the best answerConsider the given balanced chemical equation: 2H₂ + O₂ → 2H₂O. If 4 g of H₂ reacts with 32 g of O₂ to produce 28 g of H₂O, what is the percentage yield of the reaction?A63.6%B77.8%C87.5%D92.5% Like 0 Discuss 0Share
StoichiometryMolar Volume52Choose the best answerThe volume occupied by one mole of a gas at specified conditions is called:AMolar volumeBMolar massCActive massDMolecular mass Like 0 Discuss 0Share
StoichiometryMoles and Molar Mass53Choose the best answerWhich sample has the greatest mass?A2 mol CO₂B2 mol O₂C2 mol N₂D1 mol O₃ Like 0 Discuss 0Share
StoichiometryMole Concept and Number of Atoms54Choose the best answerWhat is the ratio of the total number of atoms in 2.2 g CO₂ to that in 1.7 g NH₃?A1/2B1/8C3/8D3/2 Like 0 Discuss 0Share
StoichiometryPercentage Yield55Choose the best answerWhy is the percentage yield of a reaction often less than 100%?ASome reactants may remain unreactedBProduct may be lost during separation or transferCSide reactions may produce unwanted productsDAll of the above Like 0 Discuss 0Share