# CHEM 210 Chapter Notes - Chapter 6: Molecular Mass, Stoichiometry, Formula Unit

78 views1 pages Stoichiometry
● Chemical Equations
○ Chemical
Equation-
Representation of chemical reaction
○ Stoichiometry-
Mass relationship in chemical reactions
○ Law
of
Conservation
of
Mass-

Mass cannot be created or destroyed
States
of
substances-

Gas (g), Liquid (l), solid (s), in aqueous solution
(aq)
○ Coefficients-
To balance the equation to follow the law of conservation of
mass
● Balancing Chemical Equations
○ Balanced
Chemical
Reaction-

Equal number of each atom on the
reactant and the product side
■ (Law of conservation of mass)
○ You must use coefficients to balance a chemical reaction
○ Steps to take
1. Write correct chemical formulas
2. Balance atoms using coefficients, formulas cannot be changed
3. Reduce coefficients to smallest whole number ratio, dividing by
common divisor
4. Make sure all atoms balance
● Using Math With Chemical Reactions
○ Molecular
weight-

Sum of atomic weights of all atoms in a molecule
○ Formula
Weight-
Sum of atomic weights of all atoms in a formula unit of
any compound, molecular or ionic
○ The mass of one mole of any substance is equal to its molecular or
formula weight in grams.
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## Document Summary

States of substances- gas (g), liquid (l), solid (s), in aqueous solution (aq) Coefficients- to balance the equation to follow the law of conservation of mass. You must use coefficients to balance a chemical reaction. Steps to take: write correct chemical formulas, balance atoms using coefficients, formulas cannot be changed, reduce coefficients to smallest whole number ratio, dividing by common divisor, make sure all atoms balance. Molecular weight- sum of atomic weights of all atoms in a molecule. Formula weight- sum of atomic weights of all atoms in a formula unit of any compound, molecular or ionic.

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