Note: The AAMC does not indicate which formulas should be memorized. This is a list of most of the formulas needed for the MCAT; however,
it may not be exhaustive. Examinees should understand these formulas, but not all of them need to be memorized. Judgement should be used in
deciding which to memorize. The ones that certainly should be memorized are in bold face.
General Chemistry
Number of moles = mass in grams / molecular weight
PV = nRT KE µ T v µ Ö(T/mw) PT = P1 + P2 + P3 + …
P = mole fraction of solvent x Po DP = mole fraction of solute x Po
DTBP = kb (molality of solute particles) DTFP = -kf (molality of solute particles)
Osmotic Pressure = RT [molarity of solute particles]
pH = -log10[H+] pOH = -log10[OH-]
Kw = [H+] [OH-] = 10-14 (at 25oC) pKw = 14
Ka = [H+] [A-] / [HA] Kb = [HA] [OH-] / [A-] Ka Kb = Kw = 10-14
pKa = -log10Ka pKb = -log10Kb pKa + pKb = pKw = 14 pH = pKa + log10[A-]/[HA]
DE = q + w DG = DH - TDS DG = DG° + RTlnQ Keq = eDG°/-RT
E = E° - (RT/nF)lnQ = E° - (0.026/n)lnQ Keq = enFE°/RT DG° = -nFE°
Moles = It/nF
0 order reaction: dA/dt = k At = A0 - kt
1st order reaction: dA/dt = kA At = A0e-kt
2nd order reaction: dA/dt = kA2 1/At = (1/A0) + kt |
