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Unformatted text preview: Review Session Exam 2 Calculations with Moles Through Net Ionic Equations (plus anything needed from Exam 1) Exam Topics The mole Know how to calculate moles Number of atoms, ions, and molecules in a mole Know the definition Formula Weights, molecular weights and moles Calculate the molar mass of a compound Example Question 1 E1 How many moles of K 2 HPO 4 are there in 22.8 g of potassium hydrogen phosphate? Example Question 2 E2 How many moles of oxygen atoms are there in 22.8 g of potassium hydrogen phosphate? Exam Topics Percent Composition and Formulas of Compounds Derivation of Formulas from Elemental Composition mass of element Percent Composition of element = 100% mass of compound R Example Question 3 E3. In an experiment, 6.2g of phosphorus combined with oxygen to form 14.2g of phosphorus oxide. Calculate the empirical formula of the oxide. (If the answer were C 3 H 8 , type it in as C3H8) Exam Topics Other interpretations of Chemical Formulas Know how to calculate mass of an element from the mass of a formula Know how to calculate mass of a compound from a given mass of an element Percent Purity Percentage of the pure compound in the whole sample Exam Topics Chemical Equations Know how to balance chemical equations Understand mole ratios Calculations based on Chemical Equations Must work with moles, formula units, atoms, ions, or molecules Masses (g, kg, lb, tons, etc.) must be converted to moles Example Question 4 Balance the following equation for the combustion of allene with oxygen: C 3 H 4 + O 2 CO 2 + H 2 O Express the answer as a series of numbers, for example 6149 for 6 allenes, 1 oxygen, 4 carbon dioxides, and 9 waters. If there is only 1 for a component, put in the 1. Exam Topics The Limiting Reactant Concept Remember: Reagent is the same as Reactant Must find which reactant produces the least product. Any product from the reaction can be used. The reactant the produces the least product is the limiting reactant. Example Question 5 Which is the limiting reactant in the following reaction?...
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This note was uploaded on 04/02/2008 for the course CHEM 1212 taught by Professor Suggs during the Spring '08 term at University of Georgia Athens.
 Spring '08
 Suggs
 Chemistry, Atom, Mole

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