Der Partner Experiment 12 Advance Study Assignment: Determination of the Equilib

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Der Partner Experiment 12 Advance Study Assignment: Determination of the Equilibrium Constant for a Chemical Reaction 1. A student mixes 5.00 mL 2.00 × 10 , M Fe(NO)s with 5.00 mL 2.00 × 10 s M KSCNShe finds that in the equilibrium mixture the concentration of FeSCN2, is 1.40 × 10-M. Find K for the reaction Fe' (aq) + SCN (ag) FeSCN (ag). Step 1 Find the number of moles Fe and SCN initially present. (Use Eq. 3) 0.01"10. , 200*10%-o.oo o L. 0-01 ylo-3 fromemolesFe-; 001:10.holesKN Step 2 How many moles of FeSCN are in the mixture at equilibrium? What is the volume of the equilibrium mixture? (Use Eq. 3.) 140 10- 8 and SCN are used up in making the FeSCN? moles FeSCN2 How many moles of Fe moles Fe'" ; moles SCN. · Step 3 How many moles of Fe and SCN remain in the solution at equilibrium? (Use Eq. 4 and the results of Steps 1 and 2.) moles Fe', moles SCN Step 4 What are the concentrations of Fe, SCN, and FeSCN2 at equilibrium? What is the volume of the equilibrium mixture? (Use Eq. 3 and the results of Step 3.) mL Step 5 What is the value of K, for the reaction? (Use Eq, 2 and the results of Step 4.) 103

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Der Partner Experiment 12 Advance Study Assignment: Determination of the Equilib

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