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by: Ashley Kunze
Ashley Kunze
GPA 3.61


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Class Notes
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This 2 page Class Notes was uploaded by Ashley Kunze on Thursday October 22, 2015. The Class Notes belongs to CHEM 1A at University of California Santa Barbara taught by Staff in Fall. Since its upload, it has received 27 views. For similar materials see /class/226948/chem-1a-university-of-california-santa-barbara in Chemistry and Biochemistry at University of California Santa Barbara.

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Date Created: 10/22/15
CHEM 1A CLAS Stoichiometry A chemical reaction is also a recipe for making moleculesproducts just like a recipe for making pancakes 1 cup our 2 eggs 3A cup milk 12 tsp baking powder gt 5 pancakes EX What if I have plenty of everything except eggs If I only have one egg how many pancakes can I make EX The following week I buy eggs at the store but I forget to buy milk and only have 1A cup of milk How many pancakes can I make We can do the same calculations with balanced chemical equations as our recipes where the coefficients represent the number of of each r J needed Recipe for making ammonia 3 H2 g N2 g gt 2 NH3 g Can be read as 3 moles of hydrogen gas will react with 1 mole of nitrogen gas to produce or synthesizemake 2 moles of ammonia There are two important skills that we need to practice in order to use these chemical recipes 1 Writing and balancing chemical equations we should already be semiprofessional at writing correct chemical formulas from nomenclature 2 Converting amounts to moles 1 Writing and Balancing Chemical Equations 1 cup flour 2 eggs 3A cup milk 12 tsp baking powder gt 5 pancakes 3 H2 g N2 g gt 2 NH3 g REACTANTS react to form PRODUCTS Let s practice 1 Write a balanced chemical equation for the following reactions a 6022 X 1023 atoms each of aqueous hydrochloric acid and aqueous sodium hydroxide react to form 6022 X 1023 atoms each of liquid water and aqueous sodium chloride Fquot 2 mol of solid sodium reacts with 1 mol of chlorine gas to form 2 mol of what solid salt c 1 molecule of aqueous sodium chloride will react with 1 molecule of aqueous silver nitrate to produce solid silver chloride and aqueous sodium nitrate Page 1 of3 CHEM 1A CLAS St0ichi0metry 2 Write balanced chemical equations for the following reactions a Solid iron is heated in the presence of gaseous chlorine to produce a brown solid which was found to have the empirical formula ironIII chloride b Magnesium metal reacts slowly with cold water to produce hydrogen gas and magnesium hydroxide c Octane C8H18 is a component of gasoline and its combustion results in the formation of gaseous carbon dioxide and water vapor 2 Converting Amounts t0 Moles Coefficients represent the number of moles of each compound that react so if we are given any amounts in another unit we must FIRST convert to moles Using Avogadro s Number Given amount of an element in atoms 3 Calculate the number of moles in 400 x 1021 atoms of sodium 400 x 1021 atoms x 1 mol 000664 mol Na 6022 x 1023 atoms 4 Calculate the number of atoms in 133 mol of carbon Given amount of an compound in molecules 5 Calculate the number of moles in 400 x 1023 molecules of sodium chloride 6 Calculate the number of molecules in 0364 mol of carbon dioxide Using Atomic 0r Molar Mass Given amount of an atomelement in milligrams or grams 7 Calculate the number of moles in 200 mg of aluminum 200mgx 12 x 1mol 1000 mg 2698 g 8 How much would 035 mol of liquid bromine weigh Given amount of a compound in milligrams of grams 9 Calculate the number of moles in 200 g of carbon monoxide 10 How much would 075 mol of liquid ammonia weigh Now we are set to do ANY stoichiometry problem Steps for solving stoichiometry problems 1 Write balanced chemical equation ALWAYS check that the equation is balanced 2 Convert grams of compound A to moles of compound A Page 2 of3


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