StoichiometryPercentage Composition by Mass276Choose the best answerWhat mass of oxygen is present in 72 g pure H₂O?A16 gB32 gC64 gD70 g Like 0 Discuss 0Share
StoichiometryGas Volume Stoichiometry277Choose the best answerHow many litres of CO₂ are produced when 10 L CO burns completely in O₂ at the same temperature and pressure? 2CO + O₂ → 2CO₂A20 LB10 LC5 LD2.5 L Like 0 Discuss 0Share
StoichiometryMolecular Mass278Choose the best answerThe mass of one H₂O molecule is approximately:A18 uB18 g mol⁻¹C18 mgD18 × 10⁻³ kg mol⁻¹ Like 0 Discuss 0Share
StoichiometryMolar Mass279Choose the best answerWhich pair has the same mass?A1 mol CO and 1 mol N₂B1 mol CO and 1 mol CO₂C1 mol O₂ and 1 mol N₂D1 mol O₂ and 1 mol CO₂ Like 1 Discuss 0Share
StoichiometryMole–Mass Stoichiometry280Choose the best answerIf 2.25 mol O₂ reacts completely with Al, what mass of Al is consumed? 4Al + 3O₂ → 2Al₂O₃A81 gB54 gC49.5 gD27 g Like 0 Discuss 0Share