Stoichiometry#Atomic Structure#Isotopes111Choose the best answerWhich technique is used to determine relative isotopic abundance?AX-ray diffractionBMass spectrometryCFlame testDChromatography Like 0 Discuss 0Share
StoichiometryMoles and Molar Mass112Choose the best answerWhich sample has the least mass?A0.5 mol O₂B2 mol NH₃C0.25 mol SO₂D0.5 mol H₂O Like 0 Discuss 0Share
StoichiometryMolar Mass from Gas Volume113Choose the best answerA 7.5 g sample of a gas occupies 5.6 dm³ at STP (273 K and 1 atm). Its molar mass is:A28 g mol⁻¹B30 g mol⁻¹C32 g mol⁻¹D44 g mol⁻¹ Like 0 Discuss 0Share
StoichiometryMass of a Single Molecule114Choose the best answerThe mass of one sucrose molecule, C₁₂H₂₂O₁₁, is approximately:A5.7 × 10⁻²² gB1.6 × 10⁻²² gC1.4 × 10⁻²¹ gD5.7 × 10⁻²⁰ g Like 0 Discuss 0Share
Stoichiometry#Atomic Mass Unit115Choose the best answerWhich definition of the unified atomic mass unit (u) is correct?AThe mass of one protonBThe mass of one neutronCExactly 1/12 of the mass of a carbon-12 atomDThe average mass of naturally occurring carbon atoms Like 0 Discuss 0Share