Seattle Central CHEM 161 - Chapter 3 - Stoichiometry - Mass, Formulas and reactions (6 pages)

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Chapter 3 - Stoichiometry - Mass, Formulas and reactions



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Chapter 3 - Stoichiometry - Mass, Formulas and reactions

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Lecture Notes


Pages:
6
School:
Seattle Central College
Course:
Chem 161 - General Chemistry I

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Chapter 3 STOICHIOMETRY MASS FORMULAS AND REACTIONS Problems 3 1 3 8 3 11 3 14 3 90 3 103 3 120 3 122 3 125 3 128 3 131 3 134 3 137 36 138 3 140 3 142 3 2 THE MOLE Stoichiometry STOY key OM e tree quantitative study of reactants and products in a chemical reaction Interpreting a Chemical Equation H2 g Cl2 g 1 molecule 1 molecule 2 HCl g 2 molecules It follows that any multiples of these coefficients will be in same ratio 2 H2 g O2 g 2 H2O g 1000 molecule s molecule s molecule s N molecule s molecule s molecule s Since N Avogadro s 6 022 1023 molecules 1 mole 2 H2 g mole s O2 g mole s 2 H2O g mole s Thus the coefficients in a chemical equation give the mole ratios of reactants and products Consider the following 2 C2H6 g 7 O2 g 4 CO2 g 6 H2O g 1 How many moles of O2 will react with 2 50 moles of C2H6 2 How many moles of CO2 form when 3 50 moles of O2 completely react CHEM 161 Chapter 3 v0313 page 1 of 6 3 5 STOICHIOMETRIC CALCULATIONS AND THE CARBON CYCLE Mass Mass Stoichiometry Problems MASS OF KNOWN Molar Mass MOLES OF MOLE MOLE Ratio KNOWN 3 4 Combustion Reactions MOLES OF UNKNOWN Molar Mass MASS OF UNKNOWN CO2 g H2O g CxHy O2 g CxHyOz O2 g CO2 g H2O g Hydrocarbons compounds with only C and H and hydrocarbon derivatives compounds with only C H and O burn in O2 to produce CO2 gas and steam H2O g Ex 1 Many home barbecues are fueled with propane gas C3H8 Write the balanced equation for the combustion of propane then calculate the mass in kg of carbon dioxide produced upon complete combustion of liquid propane from a 5 0 gal tank Note that 1 lb 453 6 g and the density of liquid propane at 60 F is about 4 2 lbs per gallon Ex 2 Everclear is a brand of grain alcohol that can be as high as 190 proof or 95 ethanol C2H5OH by volume Calculate the mass of carbon dioxide produced upon complete combustion of the ethanol in a 750 mL bottle of Everclear Write the balanced chemical equation for the combustion of ethanol The density of ethanol is 0 789 g mL CHEM 161 Chapter 3 v0914



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