9.0 Mole Ratios POGIL 1

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Name: Julie CanterDate: 1 / 2 1 / 2 4MoleRatiosHow can the coefficients in a chemical equationWhybe interpreted??A balanced chemical equation can tell us the number of reactant and productparticles (ions, atoms, molecules or formula units) that are necessary toconserve mass during a chemical reaction. Typically when we balance thechemical equation we think in terms of individual particles. However, in reallife the reaction represented by an equation occurs an unimaginable numberof times. Short of writing very large numbers (1022or larger) in front of eachchemical in the equation, howTcan we interpret chemical equations so thatthey more realistically represent what is happening in real life? In this activityyou will explore the different ways a chemical reaction can be interpreted.Model1 - A C h e m i c a l ReactionN2(g)+3H2(g) -. ,.2NH iq) ,1. Consider the reaction in Model 1.d. What are the coefficients for each of the following substances in theabove reaction?1N23H22NH3b. InsertyDraw particle models below to illustrate the reaction in Model 1.EXAMPLE OF A PARTICLE MODEL:2. Consider each situation below as it relates to the reaction in Model 1.d. Calculate the amount of reactants consumed and products made belowT.b. Record the ratio of N, to H. to NH_. Reduce the ratio to the lowestwhole numbers possible.NConklinHConsumNHProdftcRatioN -H -NHFor a single reaction, howmany molecules of eachsubstance w’ould be consumed1ed3ed2ed1:3:2If thereaction occurred onehundredtimes,howTmanymoleculeswouldbe1003002001:3:2If the reaction occurred 538times, how many moleculeswTould be consumed or538161410761:3:2

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3.Refer to the data table in Question 2.a. How do the reduced ratios in the last column compare to thecoefficients in the reaction shown in Modell?iheratiosstay rhe same foreaclrproblem.b. Lise mathematical concepts to explain how your answer in part a ispossible.The reduced ratio is the smallest ratio possible. Since all numbers in the ratio were multiplied by thesame number, the ratio does not change when reduced.4. Even 538 is a small number of molecules to use in a reaction. Typicallychemists use much larger numbers of molecules. (Recall that one mole isequal to 6.02 x 1023particles.) Consider each situation below’as it relatesto the reaction in Model 1: N2(g) + SHjg)-* 2NH2(g).a. Calculate the amount of reactants consumed and products made below’.b. Record the ratio of N to H to NH . Reduce the ratio to the lowest223whole number possible.NCondiimHCon&mNHProddcedRatioIf the reaction occurred6.02x1022times, howmany molecules wTouldbe consumed orproduced?How manymolesofeach sub stance wouldbe consumed orproduced in the previoussituation?6.02*lcPz318.06*H*2312.04*1U231:3:2*1321:3:25. Refer to the data table in Question 4.u. How’do the reduced ratios in the last column compare to thecoefficients in the reaction in Model IZTheratios do not change.b.Use mathemtibcaiconceptsto explain how your answ’er in partaispossible.The reduced ratio stays the same since the coefficients are all multiplied by the same number.6. The ratio obtained from the coefficients in a balanced chemical equationis calledthe mole ratio.a. What is the mole ratio for the reaction in Modelb.Explain why this ratio is called the mole ratio?This ratio is called amole ratio because it shows rhe number of moles and how they compare to rhe other moles inrhe equation.

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