Stoichiometry Stoichiometry MCQS#Mole Concept26Choose the best answerWhat is the molar mass of methane, CH₄?A1 g mol⁻¹B32 g mol⁻¹C16 g mol⁻¹D50 g mol⁻¹ Like 0 Discuss 0Share
Stoichiometry Stoichiometry MCQS#Atomic Structure#Isotopes27Choose the best answerWhich pair represents isotopes of the same element?A¹²C and ¹⁴NB³⁵Cl and ³⁷ClC⁴⁰Ar and ⁴⁰CaD²³Na and ²⁴Mg Like 0 Discuss 0Share
Stoichiometry 11#Atomic Structure#Isotopes28Choose the best answerWhy is carbon-12 used as the standard for defining atomic mass unit?ABecause carbon is the lightest element.BBecause carbon is present in all compounds.CBecause carbon-12 is radioactive.DBecause carbon-12 is a stable and common isotope with a definite mass. Like 0 Discuss 0Share
Stoichiometry Stoichiometry MCQS#Atomic and Molecular Mass29Choose the best answerIf the molecular mass of X₂ is 50 u, what is the atomic mass of X?A100 uB25 uC50 uD12.5 u Like 0 Discuss 0Share
Stoichiometry Stoichiometry MCQS#Atomic Structure#Isotopes30Choose the best answerA sample contains 51 atoms of bromine-79 and 49 atoms of bromine-81. What does this show?ASome bromine atoms are unstableBBromine has two different nucleon numbersCBromine has two different proton numbersDBromine-81 has 2 additional electrons than bromine-79 Like 0 Discuss 0Share