What you’ll learn6 learning objectivesChoose one objective for a focused lesson, or study the complete topic.1.4.1Mole (mol)• SI unit of amount of substance• One mole = Avogadro constant number of entities• Convert between amount of substance and number of specified particlesSyllabus objective1.4.2Relative atomic mass (Ar) and relative formula mass (Mr)• Compared to ¹²C standard• Determine relative formula mass from relative atomic massesSyllabus objective1.4.3Molar mass (M)• Units: g mol⁻¹• Relationships: particles ↔ moles ↔ mass• Solve mass, mole, and particle problems using n = m/MSyllabus objective1.4.4Empirical and molecular formulas• Empirical: simplest ratio of atoms• Molecular: actual number of atoms in molecule• Interconvert percentage composition and empirical formula• Determine molecular formula from empirical formula and molar massSyllabus objective1.4.5Molar concentration• Determined by amount of solute and volume of solution• Solve concentration, amount, and volume problems; square brackets mean molar concentrationSyllabus objective1.4.6Avogadro's law• Equal volumes of gases (same T, P) contain equal numbers of molecules• Mole ratio calculations with gas volumes• Use gas volume ratios from balanced equationsSyllabus objective