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CHEM3 - Chapter 3 Stoichiometry Calculations with Chemical...

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Stoichiometr y Chapter 3 Stoichiometry: Calculations with Chemical Formulas and Equations

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Stoichiometr y Anatomy of a Chemical Equation CH 4 ( g ) + 2 O 2 ( g ) CO 2 ( g ) + 2 H 2 O ( g ) coefficient subscript CH 4 ( g ) + 2 O 2 ( g ) CO 2 ( g ) + 2 H 2 O ( g ) Coefficients: the number of molecules Subscript: the number of atoms of each element in a molecule The states of the reactants and products are written in parentheses to the right of each compound. Reactants Products
Stoichiometr y Writing Balanced Chemical Equations 1. Write an equation by writing the formula of each reactant and product. 2. Count the number of atoms of each element on each side of the equation. 3. Pick an element to balance. If an element is found in only one compound on both sides, balance it first. Leave elements that are free elements somewhere in the equation until last. 4. Place the factor found to balance in front of the entire molecule. If there is already a coefficient there, multiply it by the factor. The coefficient must go in front of entire molecules, not between atoms within a molecule. 5. Recount and repeat until balanced

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Stoichiometr y Subscripts and Coefficients Give Different Information Subscripts tell the number of atoms of each element in a molecule Coefficients tell the number of molecules
y Reaction Types Combination Reactions : Two or more substances react to form one product . Decomposition Reactions : One substance breaks down into two or more substances. N 2 ( g ) + 3 H 2 ( g ) & & & 2 NH 3 ( g ) 2 Mg ( s ) + O 2 ( g ) R =B 2 MgO ( s ) CaCO 3 ( s ) &&& CaO ( s ) + CO 2 ( g ) 2 NaN 3 ( s ) R =B 2 Na ( s ) + 3 N 2 ( g ) Combustion Reactions : Rapid reactions that produce a flame. and most often involve hydrocarbons reacting with oxygen in the air to produce CO 2 and H 2 O. CH

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CHEM3 - Chapter 3 Stoichiometry Calculations with Chemical...

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