StoichiometryRelative Atomic Mass and Atomic Mass Unit176Choose the best answerOne atom of an element has a mass of 10.86 × 10⁻²⁶ kg. Which element is it most likely to be?ABoron, Ar = 11BCalcium, Ar = 40CSilver, Ar = 108DZinc, Ar = 65.4 Like 0 Discuss 0Share
StoichiometryMole Concept177Choose the best answerWhich statement is NOT correct about one mole?AIt is a counting unitBIts molar mass can be expressed in gramsCIt contains approximately 6.022 × 10²³ specified entitiesDIt contains a different number of particles for different substances Like 0 Discuss 0Share
StoichiometryMass–Mass Stoichiometry178Choose the best answerWhat mass of O₂ is required to react completely with 27 g Al? 4Al + 3O₂ → 2Al₂O₃A48 gB32 gC24 gD16 g Like 0 Discuss 0Share
StoichiometryMass–Volume Relationship179Choose the best answerWhen the mass of a solid reactant is related to the volume of a gaseous product, which stoichiometric relationship is used?AMass–mass relationshipBMass–volume relationshipCVolume–volume relationshipDNone of these Like 0 Discuss 0Share
StoichiometryGas Volume Stoichiometry180Choose the best answer100 mL each of C₂H₂ and O₂ are ignited at the same temperature and pressure: 2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O Assuming H₂O remains as vapour, the final gaseous mixture contains:A10 mL C₂H₂, 50 mL O₂, 40 mL CO₂ and 20 mL H₂OB5 mL O₂, 30 mL CO₂ and 15 mL H₂OC20 mL C₂H₂, 80 mL CO₂ and 40 mL H₂OD60 mL C₂H₂, 80 mL CO₂ and 40 mL H₂O Like 0 Discuss 0Share