Stoichiometry Review

​Georgia Standards of Excellence

SC3. Obtain, evaluate, and communicate information about how the Law of Conservation of Matter is used to determine chemical composition in compounds and chemical reactions.

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d. Use mathematics and computational thinking to identify and solve different types of reaction stoichiometry problems (i.e., mass to moles, mass to mass, moles to moles, and percent yield) using significant figures.

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e. Plan and carry out an investigation to demonstrate the conceptual principle of limiting reactants.​

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​1 mole= 6.02 x 10²³ particles

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1 mole= g molar mass (p-table)​

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1​ mole= 22.4L for a gas at STP

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​Mole Equalities

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A balanced equation tells you the mole ratio

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N₂ + 3H₂ ---> 2NH₃

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For every 1 mol for N₂ there are 3 moles of H₂ and 2 moles of NH₃​

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Limiting Reactant: When 2 substances react, it is the one that is used up first.​

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Excess Reactant: When 2 substances react, it is the one that i​s not used up completely in a reaction.

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​Visual Clue that you have a limiting reactant problem

2 givens​

Theoretical yield: •The maximum amount of product calculated using the balanced equation.

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Actual yield: •The measured amount of product obtained when the reaction takes place.

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Percent yield: •The ratio of actual yield to theoretical yield.

Percent Yield = (Actual Yield/ Theoretical Yield) x 100​