StoichiometryAvogadro Constant and Molar Mass86Choose the best answerOne Avogadro number, NA, of helium atoms has a mass of approximately:A1 gB4 gC8 gD16 g Like 0 Discuss 0Share
StoichiometryGas Volume Stoichiometry87Choose the best answerIn the reaction: N₂ + 3H₂ → 2NH₃ 6 L NH₃ is produced with no reactant left unused. What initial volumes of N₂ and H₂ were used at the same temperature and pressure?A3 L N₂ and 3 L H₂B1 L N₂ and 3 L H₂C2 L N₂ and 3 L H₂D3 L N₂ and 9 L H₂ Like 0 Discuss 0Share
StoichiometryMole Concept and Number of Molecules88Choose the best answerWhich 100 g sample contains the maximum number of molecules?AO₂BCH₄CCO₂DCl₂ Like 0 Discuss 0Share
Stoichiometry#Atomic Mass Unit89Choose the best answerOne unified atomic mass unit (1 u) is approximately equal to:A1.66 × 10⁻²⁴ gBapproximately 1.66 × 10⁻²⁷ gCapproximately the mass of one protonDA and C Like 0 Discuss 0Share
StoichiometryGas Density at STP90Choose the best answerWhat is the mass of 1 dm³ CO₂ at STP (273 K and 1 atm)?A2.4 gB4.2 gC6.45 gD1.96 g Like 0 Discuss 0Share