Practice if the density of ethanol ch 3 ch 2 oh is

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PRACTICE:If the density of ethanol, CH3CH2OH, is 0.789 g/mL, how many milliliters of ethanol are needed to produce 4.8 gof H2O in the following reaction?4 Cr (s) + 3 O2(g) 2 Cr2O3(s)8 KClO3+ C12H22O118 KCl + 12 CO2+ 11 H2OCH3CH2OH (l) + 3 O2(g) 3 H2O (l) + 2 CO2(g)CHEMISTRY - TRO 5ECH.4 - CHEMICAL REACTIONS AND CHEMICAL QUANTITIESPage 15
CONCEPT:LIMITING REAGENTLimiting Reagent:The reactant that is completely consumed in a reaction and determines the max amount of product._______________ Yield: The maximum amount of product that can form from a chemical reaction.- Also referred to as the ____________ yield or ____________ yield._____________ Reagent: The reactant that remains after the completion of the chemical reaction.- In order to determine which reactant is which we must work out the amounts of product each can make.STEP 1:Convert theGivenquantities into moles ofGiven.If any compound(s) is said to be in excess, then just ______________.STEP 2:Do aMole to Mole comparisonto convert moles ofGivenof each reactant into moles ofUnknown.STEP 3:If necessary,convert the moles ofUnknowninto the final desired units.STEP 4:Compare the final amounts of theUnknownto determine the theoretical yield.The _____ amount is for the limiting reagent, while the _____ amount is for the excess reagent._________ ofGiven_________ ofUnknown_________ ofUnknown_________ ofGiven______ , ________ , ______________ ,or ______________ ofUnknownAtomsIonsMoleculesFormula UnitsGramsMolesMole to Mole ComparisonUse the_______________in the balanced equation.The JumpReactant 1Reactant 2EXAMPLE:Chromium (III) oxide reacts with hydrogen sulfide (H2S) gas to form chromium (III) sulfide and water:Cr2O3(s)+3 H2S (g)Cr2S3(s)+3 H2O (l)What is the mass of chromium (III) sulfide formed when 14.20 g Cr2O3reacts with 12.80 g H2S?CHEMISTRY - TRO 5ECH.4 - CHEMICAL REACTIONS AND CHEMICAL QUANTITIESPage 16
CONCEPT:LIMITING REAGENTPRACTICE:Acrylonitrile (C3H3N) is the starting material for many synthetic carpets and fabrics. It is produced by thefollowing reaction:2 C3H6(g)+2 NH3(g)+3 O2(g)2 C3H3N (g)+6 H2O (g)If 12.0 g C3H6, 10.0 g NH3, and 5.0 g O2react, what mass of acrylonitrile can be produced, assuming 100% yield?PRACTICE:The reaction between solid aluminum and iron (III) chloride can generate temperatures reaching 3000 ºC andis used in welding metals.2 Al+Fe2O3Al2O3+2 FeIf 150 g of Al are reacted with 432 g of Fe2O3, what is the mass of the excess reactant remaining?CHEMISTRY - TRO 5ECH.4 - CHEMICAL REACTIONS AND CHEMICAL QUANTITIESPage 17
CONCEPT:PERCENT YIELDPercent Yielddetermines how successful the scientist was in creating their desired product.The higher the percent yield then the __________ the efficiency of a chemical reaction.In terms of percent yield values: ______ = Excellent, ______ = Very Good, ______ = Good, & ______ = PoorActual Yield: The amount of pure product ___________ created when the experiment is done in a laboratory.

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Term
Fall
Professor
WANG
Tags
Chemistry, Stoichiometry, Chemical reaction

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