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9.0 Mole Ratios POGIL 1

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    Name: Julie Canter Date: 1 / 2 1 / 2 4 Mole Ratios How can the coefficients in a chemical equation Why be interpreted? ? A balanced chemical equation can tell us the number of reactant and product particles (ions, atoms, molecules or formula units) that are necessary to conserve mass during a chemical reaction. Typically when we balance the chemical equation we think in terms of individual particles. However, in real life the reaction represented by an equation occurs an unimaginable number of times. Short of writing very large numbers (10 22 or larger) in front of each chemical in the equation, how T can we interpret chemical equations so that they more realistically represent what is happening in real life? In this activity you will explore the different ways a chemical reaction can be interpreted. Model 1 - A C h e m i c a l Reaction N 2 (g) + 3H 2 (g) - . , . 2NH iq) , 1. Consider the reaction in Model 1. d. What are the coefficients for each of the following substances in the above reaction? 1N 2 3H2 2NH3 b. 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 below T . b. Record the ratio of N, to H. to NH_. Reduce the ratio to the lowest whole numbers possible. N Conklin H Consum NH Prodftc Ratio N -H -NH For a single reaction, how many molecules of each substance w’ould be consumed 1 ed 3 ed 2 ed 1:3:2 If the reaction occurred one hundred times, how T many molecules would be 100 300 200 1:3:2 If the reaction occurred 538 times, how many molecules w T ould be consumed or 538 1614 1076 1:3:2

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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 the coefficients in the reaction shown in Model l?iheratiosstay rhe same for eaclrproblem. b. Lise mathematical concepts to explain how your answer in part a is possible. The reduced ratio is the smallest ratio possible. Since all numbers in the ratio were multiplied by the same number, the ratio does not change when reduced. 4. Even 538 is a small number of molecules to use in a reaction. Typically chemists use much larger numbers of molecules. (Recall that one mole is equal to 6.02 x 10 23 particles.) Consider each situation below’ as it relates to the reaction in Model 1: N 2 (g) + SHjg) - * 2NH 2 (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 lowest 2 2 3 whole number possible. N Condiim H Con&m NH Proddce d Ratio If the reaction occurred 6.02 x 10 22 times, how many molecules w T ould be consumed or produced? How many moles of each sub stance would be consumed or produced in the previous situation? 6.02*lcPz3 18.06*H*23 12.04* 1U 23 1:3:2* 1 3 2 1:3:2 5. Refer to the data table in Question 4. u. How’ do the reduced ratios in the last column compare to the coefficients in the reaction in Model IZThe ratios do not change. b. Use mat hemtibcai concepts to explain how your answ’er in part a is possible. 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 equation is called the mole ratio. a. What is the mole ratio for the reaction in Model b. 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 in rhe equation.

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