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Knowledge database: Stoichiometry: Fractions

Fractions are commonly used in stoichiometry and can be defined as the quotient of a phyical quantity of one component (A in the formula) by the value of (that same) physical quantity of the whole mixture.

chemistry tutorials - fractions

The mentioned definition can simply be represented by the generic formula shown above. Here we will mention the three most basic formulas for the calculation of fractions, depending on the physical quantity which they deal with:

1) The mass fraction: w(A in B) = m(A) / m(B)

2) The volume fraction: φ(A in B) = V(A) / V(B)

3) The molar fraction: x(A in B) = n(A) / n(B)



Basic laws of chemistry

   Mass and atomic number
   Relative mass of particles
   Molar mass
   Amount of substance
   Particle number

Chemical reactions

Chemical equilibrium