7186900-Mole-Ratios

# 7186900-Mole-Ratios - Stoichiometry Welcome to the...

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Stoichiometry Welcome to the wonderful world of stoichiometry. This is where the math that we’ve learned collides with all the chemistry that we’ve learned. Stoichiometry is considered difficult not because any one component of a stoichiometry problem is itself very hard, but because it ties together all that we have learned up to this point. All of the following skills will be brought together in stoichiometry: 1) Properly charge balancing ionic compounds a. Example) Iron (III) Sulfate = Fe 2 (SO 4 ) 3 not FeSO 4 2) Knowledge of the activity series a. Example) Cl replaces Br but not F etc. 3) Properly balancing chemical equations a. Example) Fe 2 (SO 4 ) 3 + 3 Ba(OH) 2 2 Fe(OH) 3 + 3 Ba(SO 4 ) 3 4) Calculating molar mass of a molecule a. Fe 2 (SO 4 ) 3 = 2*55.85 + 3*32.07 + 12*16 = 399.91 g/mol 5) Converting between grams and moles (and vice versa) a. 5 mole of Fe 2 (SO 4 ) 3 = 399.91g/mol * 5 mol = 1999.55 g b. 1 kg of Fe 2 (SO 4 ) 3 = mol g mol g 5 . 2 91 . 399 1 * 1000 = Today, we’re going to add one more skill. We’re going to learn create a mole ratio.

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7186900-Mole-Ratios - Stoichiometry Welcome to the...

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