StoichiometryPercentage Composition and Molecular Mass251Choose the best answerA compound contains two carbon atoms per molecule and is 40% carbon by mass. Its molecular mass may be:A40 uB60 uC80 uD90 u Like 0 Discuss 0Share
StoichiometryMolar Mass from Gas Volume252Choose 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 Molecule253Choose 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
StoichiometryLaw of Conservation of Mass254Choose the best answerWhich statement is always true for a balanced chemical reaction?ATotal moles of reactants and products are equalBTotal gas volumes of reactants and products are equalCTotal mass of reactants and products is equalDAll of these Like 0 Discuss 0Share
StoichiometryCombustion analysis255Choose the best answerWhich substance absorbs water during combustion analysis?A50% KOHB50% Mg(OH)₂CMg(ClO₄)₂DCaO Like 0 Discuss 0Share