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# outline3 - or more substances 2 Chemical equation has...

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Elena Shrestha 9/8/06 Pd. 1 Chpt 3 I. Stoichiometry A. Atomic Masses 1. Mass spectrometer => instrument used to accurately measure the masses of atoms 2. Average atomic mass is the mass used for that element B. The Mole 1. Mole us the number equal to the number of the atoms in the elements 2. Avogadro’s number is 6.022 X 10^23 C. Molar Mass 1. Molar mass of a substance is the mass in grams of one mole of the compound 2. Molecular weight D. Percent Composition of Compounds 1. The mass percent is called the weight percent 2. It can be calculated by dividing the number of atoms of elements in a compound 3. Must add up to 100% E. Determining the Formula of a Compound 1. Empirical formula is the most simplified version of a chemical formula 2. Molecular formula is the exact formula of the molecule involved F. Chemical Equations 1. Chemical change involves a reorganization of the atoms in one

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Unformatted text preview: or more substances 2. Chemical equation has reactants and products 3. Balance chemical equations G. Balancing Chemical Equations 1. The formulas of the compounds must never be changed in balancing a chemical equation H. Stoichiometric Calculations: Amounts of Reactants and Products 1. Mole ratio can help determine a balanced equation 2. Balance the equation for reaction 3. Convert known mass to moles 4. Use appropriate mole ratios 5. Convert moles back to grams I. Calculations Involving a Limiting Reactant 1. Stoichiometric quantities: exactly the correct amounts to that all reactants run out 2. Haber Process: production of hydrogen for manufacture of ammonia 3. Limiting reactants need to be determined 4. Theoretical yield: amount of product formed when the limiting reactant is completely consumed 5. Percent yield: the actual yield of product...
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outline3 - or more substances 2 Chemical equation has...

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