Here you will find the most common chemistry equations and formulas used in high school and fundamental university courses. These include, but are not limited to, temperature conversions, mole equations, pH, and ideal gas laws.
For more chemistry formulas visit Wikipedia.
A mole is an SI unit for measuring an amount of substance. The number of moles of anything can be calculated by taking the number of particles, (atoms, things, etc.) and dividing it by Avogadro’s number.
# Moles = (#Particles) x 

Most chemistry equations use temperature in degrees C or Kelvins. If given temperature in F, you can convert to C with the following equation.
℃ = (℉  32) x 

If given temperature in C, you can convert to F with the following equation.
℉ = (℃ x 

) + 32 
If given temperature in C, you can convert to K with the following equation.
K = ℃ + 273.15 
Molarity is a measure of solution concentration which is calculated as the moles of solute per liter of solution.
moles _{solute} 
L _{solution} 
Molality is a measure of solution concentration which is calculated as the moles of solute per kilogram of solvent.
moles _{solute} 
kg _{solvent} 
pH & pOH
pH =  log[H^{+}]
pOH =  log log[OH^{}]
pH specifies the acidity or basicity of a solution, where [H^{+}] means the concentration of hydrogen ions and [OH^{}] is the concentration of hydroxide ions.
Relationship between pH and pKa
pH = pK_{a} + 

= pK_{a} + 

Particles can behave like waves. A wavelength can be given to a particle if the mass m and velocity v is known. h is Planck’s constant.
λ = 

Where h is Planck’s constant
E = hf = 


c = λf 
Used when temperature is constant. P1 and V1 are the initial pressure and volume, and P2 and V2 are the new volume and pressure.
P_{1}V_{1} = P_{2}V_{2} 
Used when pressure is constant. V1 and T1 are the initial volume and temperature, and T2 and V2 are the new temperature and pressure.

= 

Where R is the ideal gas constant
PV = nRT 
Where m is mass of a substance (kg), c is the specific heat (J/kg∙K), and ∆T is change in temperature (Kelvins, K or Celsius, C)
Q = mC ΔT 