Lab 03-Lab Ticket Part 2" due Monday, Feb 11 at the beginning of Lab Part 1: Review of HW 3 and Lab 3 (Complete after HW 3 is due: attempt to do a first pass without additional help (only formula card and calculator) Facebook Friends: Based on a study of U.S. Facebook users in 2014, the most connected age group were Facebook users between 18 and 24 years, averaging 649 friends on the social media website. Assume the distribution for the number of Facebook friends for this age group is approximately normal with mean of 649 friends and a standard deviation of 150 friends. Based on the model, determine the value that would correctly complete the sentence below The top 15% of most connected Facebook users between 18 to 24 years will have at least a. riends Final Answer: at least friends Based on the model, what is the probability that a randomly selected Facebook user between 18 to 24 years has at least 844 friends? b. Final Answer Consider a random sample of 8 Facebook users between 18 to 24 years. What is the probability that exactly 3 of the 8 Facebook users will have at least 844 friends? c. Final Answer:

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Experiment 23 Advance Study Assignment: Determination of the Equilibrium Constant for a Chemical Reaction A student mixes 5.00 mL 2.00 × 10-"M FeNO), in l M HNO, with 3.00 mL 2.00 x 10-1 M KSCN and 2.00 mL of water. She finds that in the equilibrium mixture the concentration of FeSCN2+ is 7.0 × 10 Find K. for the reaction Fee (aq) + SCN-(aq)·n FSC02+ (aq). 1. 5 M. Step 1 Find the number of moles Fe and SCN" initially present. (Use Eq. 3.) IL 1moles Femoles SCN Step 2 How many moles of FeSCN are in the mixture at equilibrium? What is the volume of the equi- librium mixture? (Use Eq. 3.1 IL How many moles of Fe and SCN" are used up in making the FeSCN+ Step 3 How many moles of Fe" and SCN remain in the solution at equilibrium? (Use Eq. 4 and the results of Steps I and 2.) Step 4 What are the concentrations of Fe", SCN , and FeSCN at equilibrium? (Use Eq. 3 and the results of Step 2 and Step 3.) OIL 0.01L 001L Step 5 What is the value of K, for the reaction? (Use Eq. 2 and the results of Step 4) x 10 5 (9.3 x 0.9(53 x K,-142 142.6 ) (continued on following page) 94 Experiment 23 Detemination 2. Opsional Assume that the reaction studied in Problem 1 isFe (aq)+2 SCN (aq) of the Equilibrium Constant for a Chemical Reaction e(SCN), "(aq) Find K, for this reaction, given the data in Problem I. Formulate the expression for K, for the alternate reaction just cited. b Find K, as you did in Problem I: take due account of the fact that two moles SCN are used up per mole Fe(SCN) formed as you carry out the following calculations: Step 1 Results are as in Problem 1 Step 2 How many moles of Fe(SCN) are in the mixture at equilibrium? (This will be the same as in Problem 1.) moles Fe(SCN)2 How many moles of Fel" and SCN are used up in making the FerSCN),"7 moles Fe"; moles SCN Step 3 How many moles of Fe3 and SCN remain in solution at equilibrium? Use the results of Steps 1 and 2, noting that moles SCN at equilibrium original moles SCN -(2 X moles Fe(SCN)2) moles Fe";moles SCN Step 4 What are the concentrations of Fe, SCN. and Fe(SCN)2 at equilibrium? (Use Eq. 3 and the results of Step 3.) M: [Fe(SCN)2+1- M Step 5 Calculate K, based on the assumption that the alternate reaction occurs.(Use the answer to Part 2a.)

What is wrong with the following piece of mRNA? TACCAGGATCACTTTGCCA Multiple Choice It contains A. O It does not include an equal number of As and Ts. It does not include an equal number of Gs and Cs. It contains T and not U. What is wrong with the following piece of mRNA? TACCAGGATCACTTTGCCA Multiple Choice It contains A. It does not include an equal number of As and Ts. It does not include an equal number of Gs and Cs.