BasicsStoichiometry #Atomic Structure#Isotopes16Choose the best answerAn element X has isotopes ¹²⁵X, ¹²⁶X and ¹³¹X. How do these isotopes differ?AThe isotopes have different numbers of protonsBThe isotopes have different numbers of neutronsCThe isotopes have more electrons and protonsDThe isotopes have the same number of protons and neutrons Like 0 Discuss 0Share
BasicsStoichiometry #Mole Concept17Choose the best answerA sample contains 1.204 × 10²⁴ CO₂ molecules. How many moles of CO₂ are present?A0.5 molB1.0 molC2.0 molD4.0 mol Like 0 Discuss 0Share
BasicsStoichiometry #Mole Concept18Choose the best answerOne mole of NH₃ contains:A1 atom of NB1 mol of total atomsC3 mol of H atomsDNₐ total atoms Like 0 Discuss 0Share
BasicsStoichiometry #Mole Concept19Choose the best answerWhich sample contains the greatest total number of atoms?A1 mol N₂B1 mol COC1 mol N₂OD1 mol NaCl Like 0 Discuss 0Share
BasicsStoichiometry #Mole Concept20Choose the best answerWhich option correctly gives a molar mass?A1 g of HB32 u for an O₂ moleculeC16 g mol⁻¹ for CH₄D50 u for a CaCO₃ formula unit Like 0 Discuss 0Share