Chemistry Paper 1 - Key Maths Formulas 0.0 / 5 ? ChemistryAcids, bases and saltsEnthalpyEntropySpectroscopyAtomic StructureA2/A-levelAQA Created by: fs20/22Created on: 21-12-21 11:36 Mr = Average mass of an atom ÷ 1/12 mass of one atom of C-12 1 of 15 (Relative abundance of isotopes) RAM = Sum of (isotope mass number x isotope abundance) ÷ sum of abundances 2 of 15 (Mass spectrometry when KE is known) t = d x √ (m ÷ 2KE) 3 of 15 (Mass spectrometry when KE is known) d = t x √ (2KE ÷ m) 4 of 15 (Mass spectrometry when KE is unknown) t ₂ = √ [(m₂ ÷ m₁) x (t₁)²] 5 of 15 (Given that Avogadro’s constant is 6.022 x 10²³) Mass = Mass number ÷ (1000 x 6.022 x 10²³) 6 of 15 ΔG (Gibb’s free energy) = ΔH - TΔS (where ΔH is enthalpy change & ΔS is entropy change) 7 of 15 Mole fraction = Moles ÷ total moles 8 of 15 Partial pressure = Mole fraction x total pressure 9 of 15 Kp (all reacts & products in same state) [(partial pressure of C)^moles][(partial pressure of D)^moles] ÷ [(partial pressure of A)^moles][partial pressure of B)^moles] 10 of 15 Kp (reactants & products in different states) [(partial pressure of gaseous reactant)^moles] ÷ [(partial pressure of gaseous product)^moles] 11 of 15 pH = -log10[H+] 12 of 15 Kc (equilibrium constant) = [H+][OH-] ÷ [H₂O] 13 of 15 Kw (dissociation constant of water) = [H+][OH-] 14 of 15 Ka (acid dissociation constant) = [H+][A-] ÷ [HA] 15 of 15
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