Chapter 3 -lecture 3

Chapter 3 -lecture 3 - General Chemistry I Fall 2007 Joann...

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Unformatted text preview: General Chemistry I Fall 2007 Joann S. Monko Chemistry 9th ed. Raymond Chang How many grams of water would you expect to lose from heating 10.00 g sample of MgSO 4 • 7 H 2 O (Epsom salts) to dryness? How many grams of anhydrous salt would be left over? Percent Composition Percent Composition NO NO , nitrogen dioxide vs. , nitrogen dioxide vs. NO NO , nitrogen monoxide , nitrogen monoxide (or nitric oxide) (or nitric oxide) Consider NO Consider NO 2 , Molar mass = ? , Molar mass = ? Wt. % O = 2 (16.0 g O per mole ) 46.0 g x 100% = 69.6% Wt. % N = 14.0 g N 46.0 g NO 2 • 100% = 30.4 % What are the weight percentages of What are the weight percentages of N and O in NO? N and O in NO? Kotz &Treichel Chemistry & Chemical Reactivity 5th ed. Chemical Equations Show… reactants & products and their relative amounts in a reaction. 4 Al (s) + 3 O 2 (g) ---> 2 Al 2 O 3 (s) The numbers in the front are called stoichiometric coefficients . The letters ( s ), ( g ), ( l ), and ( aq ) are the physical states of compounds. Chemical Equations 4 Al 4 Al (s) (s) + 3 O + 3 O 2 2 (g) (g)---> 2 Al---> 2 Al 2 2 O O 3 3 (s) (s) This equation means: This equation means: 4 4 Al Al atoms atoms + + 3 3 O O 2 molecules molecules---yields--->---yields---> 2 2 molecules molecules of Al of Al 2 O O 3 4 moles 4 moles of Al of Al + 3 moles + 3 moles of O of O 2---yields--->---yields---> 2 moles 2 moles of Al of Al 2 O O 3 Balancing Equations ___ Al ___ Al (s) (s) + ___ Br + ___ Br 2 2 (liq) (liq)---> ___ Al---> ___ Al 2 Br Br 6 6 (s) (s) Kotz &Treichel Chemistry & Chemical Reactivity 5th ed....
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Chapter 3 -lecture 3 - General Chemistry I Fall 2007 Joann...

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