CHEM 1030 Lecture : Stoichiometry; Calculations with Chemical Formulas and Equations

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fuchsiaplatypus817

18 Dec 2013

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CHEM 1030 Full Course Notes

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Chapter 3: stoichiometry; calculations with chemical formulas and equations. Chemical equations: concise representations of chemical reactions. Formula weight (fw): a formula weight is the sum of the atomic weights for the atoms in a chemical formula: formula weights are generally reported for ionic compounds. Molecular weight (mw: a molecular weight is the sum of the atomic weights of the atoms in a molecule. Percent composition: one can find the percentage of the mass of a compound that comes from each of the elements in the compound by using this equation: Using moles: moles provide a bridge from the molecular scale to the real-world scale. Calculating empirical formulas: one can calculate the empirical formula from the percent composition. Combustion analysis: compounds containing c, h and o are routinely analyzed through combustion in a chamber like this. C is determined from the mass of co2 produced. H is determined from the mass of h2o produced.

Related Questions

Which of the following statements is true about chemical reactions?

a. When balancing a chemical equation, you can never change the coefficient in front of any chemical formula.

b. The coefficients in a balanced chemical equation refer to the number of grams of reactants and products.

c. In a chemical equation, the reactants are on the right and the products are on the left.

d. When balancing a chemical equation, you can never change the subscripts of any chemical formula.

e. In chemical reactions, matter is neither created nor destroyed so a chemical equation must have the same number of atoms on both sides of the equation.

indigolouse566

Which of the following statements about chemical equations is(are) true?

a. When balancing a chemical equation, you can never change the coefficient in front of any chemical formula.

b. The coefficients in a balanced chemical equation refer to the number of grams of reactants and products.

c. In a chemical equation, the reactants are on the right and the products are on the left.

d. When balancing a chemical equation, you can never change the subscripts of any chemical formula.

e. In chemical reactions, matter is neither created nor destroyed so a chemical equation must have the same number of atoms on both sides of the equation.