Stoichiometry_

Stoichiometry_ - Topic 1 Stoichiometry 1.1 Mole Concept and...

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Topic 1 Stoichiometry 1.1 Mole Concept and Avogadro’s Constant 1.1.1 Describe the mole concept and apply it to substances. The mole concept applies to all kinds of particles: atoms , molecules, ions , formula units etc. The amount of substance is measured in units of moles. The approximate value of Avogadro’s constant ( L ) , 6.02 X10 23 , should be known. 1.1.2 Calculate the number of particles and the amount of substance (in moles) Convert between the amount of substance ( in moles ) and the number of atoms , molecules or formula units. 1.2 Formulas 1.2.1 Define the term molar mass (M ) and calculate the mass of one mole of a species. 1.2.2 Distinguish between atomic mass , molecular mass and formula mass. The term molar mass ( in g mol -1 ) can be used for all of these. 1.2.3 Define the terms relative molecular mass ( Mr ) and relative atomic mass ( Ar) . The terms have no units. 1.2.4 State the relationship between the amount of substance ( in moles ) and mass , and carry out calculations involving amount of substance, mass and molar mass. 1.2.5 1.2.5 Define the terms empirical formula and molecular formula. The molecular formula is a multiple of the empirical formula. 1.2.6 Determine the empirical formula and/or the molecular formula of a given compound. Determine the : empirical formula from the percentage composition or from other suitabel experimental data . percentage composition from the formula of a compound molecular formula when given both the empirical formula and the molar mass. 1.3 Chemical Equations 1.3.1 Balance chemical equations when all reactants and products are given. Distinguish between coefficients and subscripts. 1.3.2 identify the mole ratios of any two species in a balanced chemical equation. Use balanced chemical equations to obtain information about the

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amounts of reactants and products. 1.3.3 Apply the state symbols(s), (l) (g) and (aq). Encourage the use of state symbols in chemical equations. 1.4 Mass and Gaseous Volume Relationships in Chemical Reactions 1.4.1 Calculate stoichiometric quantities and use these to determine experimental and theoretical yields. Mass is conserved in all chemical reactions.Given a chemical equqtion and the mass or amount (in moles ) of one species, calculate the mass or amount of another species. 1.4.2 Determine the limiting reactant and the reactant in excess when quantities of reacting substances are given. Given a chemical equation and the initial amounts of two or more reactants: identify the limiting reactant. Calculate the theoretical yield of a product. Calculate the amount(s) of the reactant(s) in excess remaining after the reactions is complete. 1.4.3 Apply Avogadro’s law to calculate reacting volumes of gases. 1.5 Solutions
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This note was uploaded on 08/08/2008 for the course CEM 141 taught by Professor Hunter during the Fall '08 term at Michigan State University.

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Stoichiometry_ - Topic 1 Stoichiometry 1.1 Mole Concept and...

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