Etiket Arşivleri: reactants and products

Material Balance With Chemical Reaction

Stoichiometry

For the chemical reaction: aA + bB → cC + dD

a,b,c,d are the Stoichiometric Coefficients, representing the molar balance of the equation. a moles of A react with b moles of B to form c moles of C and d moles of D. The stoichiometric coefficients can refer to g-moles, lb-moles, kmols, etc., but NOT g, lbm, kg or any units of mass.

So, the reaction equation DOES show:

• The reactants and products

• The molar ratios of species involved in the reaction

It DOES NOT show:

• How fast the reaction goes (Kinetics)

• How far the reaction goes (Thermodynamics, Kinetics)

• The reaction mechanism (Chemistry)

Laboratory‎ > ‎Chemical Kinetics

The detailed explanation at the molecular level how a reaction proceeds is called reaction mechanism. The explanation is given in some elementary steps. Devising reaction mechanisms requires a broad understanding of properties of reactants and products, and this is a skill for matured chemists. However, first year chemistry students are often given a mechanism, and be asked to derive the rate law from the proposed mechanism. The steady-state approximations is a technique for deriving a rate law from the proposed mechanism.