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# Stoichiometry

is the calculation of quantitative (measurable) relationships of the reactants and products in a balanced chemical reaction.
by

## Shanna Ingersoll

on 30 July 2010

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#### Transcript of Stoichiometry

Stoichiometry What is it? is the calculation of quantitative (measurable) relationships of the reactants and products in a balanced chemical reaction. Rules for stoichiometry 1.)Write a balanced equation
2.)Write the given
3.)Write x _______
4.)Convert the given to moles using molar mass or molar volume(put the desired unit on top and the unit to cancel on bottom
5.)Convert to desired substance to desired unit using molar mass or molar volume
6.)Multiply the top then divide by the bottom
Mole Ratio The ratio of the moles of one reactant or product to the moles of another reactant of product in the balanced equation for a chemical reaction. Actual Yield The measured amount of a product of a reaction Amount of product that would be formed if the reaction went to completion Theoretical Yield Formula Actual Yield ___________ Theoretical Yield = x 100 Percent Yield Percent Yield the actual yield of an experiment divided by the theoretical yield and multiplied by 100 The substance that controls the quantity of product that can form in a chemical reacton Limiting Reactant Excess Reactant The substance that is not used up completely in a reaction Volume A measure of the size of a body or region in 3-D shape Mass A measure of the amounts of matter in an object; a fundmental property of an object that is not effected by the forces that act on the object, such as gravitational force Definitions The ratio of the mass of a substance to the volume of the substance; often expressed as grams per cubic centimeter for solids and liquid and as grams per liter for gases Density Moles A mole is the amount of pure substance containing the same number of chemical units as there are atoms Sample Problems Given: 3.3 moles O2 Unknown: ? moles H2 Equation
Substitute > 3.3 moles O2 x 16 grams O2 x 2 grams H2 x 2 Mole H2 __________________________________________________ 1 mole O2 16 grams O2 2 grams H2 2H 2 +O 2 Formula = 2H 2 O Solution = 6.6 mole H 2 Mr. Reyerson Mr. Reyerson Mr. Reyerson Mrs. Bates Mr. Mugan By: Shanna Ingersoll & Liz Moerer
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