UHS MDCAT 2025 Chemistryuhs mdcat chemistry 2025#Percentage Yield#Stoichiometry6Choose the best answerA chemical reaction has a theoretical yield of 25 g, but only 20 g of product was obtained, What is the percentage yield of the reaction?A20%B25%C45%D80% Like 3 Discuss 3Share
StoichiometryMolar Volume at STP7Choose 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
Stoichiometry 11#Ionic Compounds8Choose the best answerWhy is formula mass used for NaCl instead of molecular mass?ANaCl has a very high massBNaCl exists only in the solid stateCNaCl forms an ionic lattice instead of separate moleculesDSodium is a metal Like 0 Discuss 0Share
StoichiometryVapour Density and Molar Mass9Choose the best answerAt STP, 5.6 L of a gas weighs 8 g. Its vapour density relative to H₂ is:A32B16C8D4 Like 0 Discuss 0Share
StoichiometryMolar Volume and Number of Moles10Choose the best answerWhich sample contains the greatest number of moles?A11.2 dm³ H₂ at STPB44.8 dm³ N₂ at STPC67.2 dm³ CO₂ at STPD22.4 dm³ O₂ at STP Like 0 Discuss 0Share