StoichiometryMole Concept216Choose 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
StoichiometryBalancing Chemical Equations217Choose the best answerWhen the equation is balanced: C₃H₈ + O₂ → CO₂ + H₂O the coefficient of O₂ is:A1.5B3.5C3D5 Like 2 Discuss 1Share
StoichiometryMass of a Single Molecule218Choose the best answerThe mass of one H₂O molecule is approximately:A3 × 10⁻²⁶ kgB3 × 10⁻²⁰ kgC6 × 10⁻²⁰ kgD1.5 × 10⁻²⁶ kg Like 3 Discuss 0Share
StoichiometryCombustion analysis219Choose the best answerWhich method is commonly used to analyze organic compounds containing C, H and O?ADecompositionBHydrogenationCCombustionDReduction Like 0 Discuss 0Share
StoichiometryMolar Volume at STP220Choose the best answerAn 8 g sample of O₂ occupies what volume at STP (273 K and 1 atm)?A22.4 dm³B11.2 dm³C5.6 dm³D2.8 dm³ Like 0 Discuss 0Share