StoichiometryMass–Mole Stoichiometry191Choose the best answerAn 8 g sample of CH₄ burns completely: CH₄ + 2O₂ → CO₂ + 2H₂O How many moles of H₂O are produced?A0.5 molB0.25 molC1.0 molD2.0 mol Like 0 Discuss 0Share
StoichiometryMass–Mole Conversion192Choose the best answerHow many moles of CO₂ are present in 220 mg CO₂?A5.0 × 10⁻³ molB5.0 × 10⁻² molC0.50 molD5.0 mol Like 0 Discuss 0Share
BasicsStoichiometry #Physical and Chemical Changes193Choose the best answerWhich change leaves the chemical composition of a substance unchanged?APhysical changeBChemical changeCNuclear changeDAtomic change Like 0 Discuss 0Share
StoichiometryMole Concept and Number of Molecules194Choose the best answerWhich sample contains the same number of molecules as 16 g O₂?A8 g O₂B16 g SO₂C32 g SO₂D64 g SO₂ Like 0 Discuss 0Share
StoichiometryMole Concept and Number of Ions195Choose the best answer55.5 g CaCl₂, with molar mass 111 g mol⁻¹, is completely dissolved in water. What is the total number of ions produced?ANAB1.5NAC2.5NAD3NA Like 0 Discuss 0Share