Stoichiometry 11#Atomic Structure#Isotopes56Choose the best answerAn element contains 75% of an isotope of mass 24 u and 25% of an isotope of mass 26 u. What is its relative atomic mass?A24.0B24.5C25.0D25.5 Like 0 Discuss 0Share
Stoichiometry 11#Atomic Structure#Isobars57Choose the best answerWhich pair represents isobars?A³⁵Cl and ³⁷ClB¹²C and ¹³CC⁴⁰Ar and ⁴⁰CaD²³Na and ²⁴Na Like 0 Discuss 0Share
Stoichiometry 11#Atomic Mass Comparison58Choose the best answerElements A and B have atomic masses 10 u and 20 u. What is the atomic-mass ratio B:A?A1:2B2:1C1:1D4:1 Like 0 Discuss 0Share
Stoichiometry Element #Mixtures59Choose the best answerWhich substance can be separated into its components by physical methods?AAirBSodium chlorideCPure waterDCarbon dioxide Like 0 Discuss 0Share