PLEASE HELP ME AND WORK OUT THE ANSWERS. THESE ARE HARD Consider the reaction of
ID: 988708 • Letter: P
Question
PLEASE HELP ME AND WORK OUT THE ANSWERS. THESE ARE HARD
Consider the reaction of trans-stilbene with a solution of bromine to form stilbene dibromide, shown below.
A) This reaction involves reacting 4 g of trans-stilbene with 24.5 mL of 1M bromine solution. This corresponds to ____________ mmoles of trans-stilbene and ____________ mmoles of bromine. (Write your answers as xx.xx)
B) Using the equation and reagent amounts listed in this question, what is the limiting reagent in this reaction?
trans-stillbene
stilbene dibromide
bromine
C) Using the reaction equation and amounts listed in this question what is the theoretical yield of stilbene dibromide? (Write your answer in the form x.xxx g)
D) Suppose you isolate a product. You run a melting point and find it to be 200-212 C. What conclusions can you make?
a) The melting point indicates that the "product" is entirely an unidentified side product.
b) The depressed and broadened melting point indicates that there are impurities mixed in with the product.
c) The depressed melting point indicates that no reaction occurred, only starting material was recovered.
d) The melting point is close to the literature melting point for stilbene dibromide, therefore the pure product was obtained
I NEED HELP FAST. THERE IS A TIME LIMIT ON THIS HOMEWORK :(
a)trans-stillbene
b)stilbene dibromide
c)bromine
Explanation / Answer
millimoles = weight / molar mass x 1000
= 4 / 180.09 x 1000
= 22.21 mmol trans-stilbene
Br millimoles
24.5 mL of 1M solution bromine
that means 24.5 mmol
B
limiting agent is
trans-stillbene
C
from the reaction
22.21 mmols of stilbene dibromide should form
stilbene dibromide in grams = 22.21 x 337.93 / 1000
= 7.5058 grams
D
The depressed and broadened melting point indicates that there are impurities mixed in with the product.
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