Conservation of Matter and Stoichiometry

3. The conservation of atoms in chemical reactions leads to the principle of conservation of matter and the ability to calculate the mass of products and reactants.

As a basis for understanding this concept, students know:

a. how to describe chemical reactions by writing balanced equations.
b. the quantity one mole is defined so that one mole of carbon 12 atoms has a mass of exactly 12 grams.
c. one mole equals 6.02x10^23 particles (atoms or molecules).
d. how to determine molar mass of a molecule from its chemical formula and a table of atomic masses, and how to convert the mass of a molecular substance to moles, number of particles or volume of gas at standard temperature and pressure.
e. how to calculate the masses of reactants and products in a chemical reaction from the mass of one of the reactants or products, and the relevant atomic masses.
f.* how to calculate percent yield in a chemical reaction.
g.* how to identify reactions that involve oxidation and reduction and how to balance oxidation-reduction reactions.

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