StoichiometryMass–Mass Stoichiometry286Choose the best answerHow many grams of O₂ are required to produce 1.8 g H₂O? 2H₂ + O₂ → 2H₂OA32 gB16 gC1.6 gDNone of these Like 0 Discuss 0Share
BasicsStoichiometry #Elements287Choose the best answerWhich statement correctly describes an element?AIt contains only one type of atomBIt can be broken into simpler substances by ordinary chemical reactionsCIt must always exist as moleculesDIt is always a metal Like 0 Discuss 0Share
StoichiometryMolar Volume at STP288Choose the best answerThe conventional molar volume of 22.4 dm³ mol⁻¹ corresponds to:A0°C and 1 atmB273°C and 1 atmC0°C and 273 atmD273 K and 273 atm Like 0 Discuss 0Share
StoichiometryGas Volume, Mass and Molar Mass289Choose the best answerFor equal masses of O₂, H₂ and CH₄ at the same temperature and pressure, the volume ratio O₂ : H₂ : CH₄ is:A1 : 1 : 1B1 : 16 : 2C2 : 16 : 2D2 : 16 : 1 Like 0 Discuss 0Share
StoichiometryMole Concept and Number of Protons290Choose the best answerHow many protons are present in 1 mol H₂?A6.02 × 10²³B1.20 × 10²⁴C12.04 × 10²²D6.02 × 10²⁴ Like 0 Discuss 0Share