Chemistry - The Mole, Stoichiometry, and redox reactions

Define relative atomic mass

The mass of one atom is relative to 1/12 of the mass of an atom of carbon-12

Define relative isotopic mass

The mass of one atom of an isotope is relative to 1/12 of the mass of an atom of carbon-12

Define molecular mass

The mass of a molecule is relative to 1/12 of the mass of an atom of carbon-12

Define formula mass

The mass of one formula unit of the substance is relative to 1/12 of the mass of an atom of carbon-12

Define mole in terms of Avogadro’s constant

One mole contains exactly 6.02 × 10²³ elementary entities

Define empirical formula

Empirical formula is the SIMPLEST FORMULA that shows the relative number of atoms each element present in a compound

Define molecular formula

The molecular formula shows the actual number of atoms each element present in one molecule of a compound

What is the general formula for combustion?

CₓHᵧ (g) + (x+ y/4)O₂ (g) → xCO₂ (g) + y/2 H₂O (l)

Does dilution change (solute) added to the solvent?

NO!!

Take note: Dilution only changes the [solute] (decreases), NOT (solute)

Hence no. of moles in original solution = no- of moles in diluted solution (C₁V₁=C₂V₂) (★ V₂ is the DILUTED VOLUME or FINAL VOLUME, NOT the volume of water to be added to the original solution)