StoichiometryMole Concept and Number of Atoms241Choose the best answerWhat is the total number of atoms present in 6 g H₂O?ANAB2NAC3NAD(1/3)NA Like 0 Discuss 0Share
Stoichiometry#Atomic Structure#Isotopes242Choose the best answerDempster’s mass spectrometer was developed to study isotopes of elements initially available in which state?AGaseous stateBLiquid stateCSolid stateDIonized form Like 0 Discuss 1Share
StoichiometryMole–Mole Stoichiometry243Choose the best answer27 g Al reacts with O₂ according to: 4Al + 3O₂ → 2Al₂O₃ How many moles of O₂ are required?A3 molB0.27 molC0.75 molD1.5 mol Like 0 Discuss 0Share
Stoichiometry#Atomic Structure#History of Atomic Theory244Choose the best answerWhich contributions are associated with J. J. Berzelius?ADetermined atomic masses of elementsBDetermined atomic numbersCDeveloped modern chemical symbolsDA and C Like 0 Discuss 0Share
StoichiometryMole–Volume Stoichiometry245Choose the best answerHow many moles of Mg are required to produce 11.2 dm³ H₂ at STP (273 K and 1 atm)? Mg + 2HCl → MgCl₂ + H₂A1 molB2 molC0.5 molD0.25 mol Like 0 Discuss 0Share