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Safari File Edit View History Bookmarks window Help 68%(-1. Sun 7:28 PM 9 :E Take Test: Online Quiz #1-CHEM-2255-003-89424-SP-2016 + E httpse courses.cscc.edu webapps/assessment/take/launch.jsp?course-assessment id--445578 1&course; id--108901_1&content;_id=7404321_1&step-null; Statistics f I Chegg.com MEN CORDUR I UNIQLO Evolution Ec I StudyBlue Calculus 1 s-YouTube Calculus 1 s-YouTube CNCPTS / Timberland iphixcs.com lus%201.pdf ¢ Reader | Online quiz - CHEM-2255-003-89424-SP.. Take Test: Online Quiz #1-CHEM-2255-... (no subject) - mahdiwarsa00@gmail.com... Google QUESTION 12 2 points Save Answer Consider the reaction of trans-stilbene with a solution of bromine to form stilbene dibromide, shown below. Br Br Br mw 180.25 g/mol mp = 123-125 C 1 M in CH2C2 mw of Br2 159.8 g/mol mw 340.05 g/mol mp = 241 C mmoles of trans-stilbene and 24.50 This reaction involves reacting 4 g of trans-stilbene with 24.5 mL of 1M bromine solution. This corresponds to mmoles of bromine. (Write your answers as xx.xx) Remaining Time: 1 hour, 30 minutes, 52 seconds. QUESTION 13 Using the equation and reagent amounts listed in question 12, what is the limiting reagent in this reaction? Question Completion Status: trans-stillbene bromine stilbene dibromide QUESTION 14 2 points Save Answer Using the reaction equation and amounts listed in question 12, what is the theoretical yield of stilbene dibromide? (Write your answer in the form x.xxx g) Ou

Explanation / Answer

Answer – 12 ) Given, mass of trans-stilbene = 4.0 g , volume of bromine = 24.5 mL , [Br2] = 1 M

Moles of trans-stilbene = 4.0 g / 180.25 g.mol-1

                                      = 0.0222 moles

We know ,

1 mol = 1000 mmol

So, 0.0222 moles = ?

= 22.2 mmoles of trans-stilbene

Moles of Br2 = 1.0 M * 0.0245 L

                      = 0.0245 moles

                    = 24.5 mmoles of Br2

14) From the given balanced reaction all has mole ratio 1:1

So, moles of trans-stilbene = 1 moles of stilbene dibromide

1 mole of Br2 = 1moles of stilbene dibromide

So, moles of stilbene dibromide from trans-stilbene is 0.0222 moles

And form the Br­2 it is 0.0245 moles

The moles of stilbene dibromide are lowest from the trans-stilbene, so limiting reactant is trans-stilbene and

Moles of stilbene dibromide = 0.0222 moles

Theoretical yield of stilbene dibromide = 0.0222 moles * 340.05 g/mol

                                                               = 7.546 g

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