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

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25 Oct 2017
School
Course
Professor
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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