StoichiometryGas Volume and Mass Stoichiometry261Choose the best answerIn the reaction: 2NO + O₂ → 2NO₂ 560 cm³ NO₂ is produced at STP (273 K and 1 atm), while 50 mg O₂ remains unused. What were the initial masses of NO and O₂?A0.6 g NO and 0.4 g O₂B0.75 g NO and 0.45 g O₂C6.0 g NO and 4.5 g O₂D0.3 g NO and 0.37 g O₂ Like 0 Discuss 0Share
StoichiometryLimiting Reagent262Choose the best answerA limiting reagent is the reactant that:AIs consumed laterBIs consumed firstCRemains unchangedDIs always present in excess Like 0 Discuss 0Share
StoichiometryPercentage Composition by Mass263Choose the best answerWhat is the percentage of carbon by mass in CaCO₃?A6%B12%C40%D48% Like 0 Discuss 0Share
StoichiometryMolecular Formula and Molar Mass264Choose the best answerOne mole of a compound contains 1 mol C atoms and 2 mol O atoms. Its molar mass is:A3 g mol⁻¹B12 g mol⁻¹C32 g mol⁻¹D44 g mol⁻¹ Like 0 Discuss 0Share
StoichiometryMole#Mole Concept265Choose the best answerWhich statement is correct for 98 g (1 mol) of H₂SO₄?Atwice the Avogadro's number of oxygen atomsBfour times the Avogadro's number of atomsCtwice the Avogadro's number of hydrogen atomsDB and C Like 0 Discuss 0Share