Interpretation:
From the given table, the polymer with the largest molar mass needs to be determined. Assuming the number of monomer units are same in all the
Concept introduction:
A polymer is a long chain consists of large number of monomer units. In a polymer, the monomers are linked to each other in a continuous or repetitive manner. These monomer units are linked to each other either through the formation of peptide linkage, glycosidic linkage or by removal of any moiety such as a water molecule. Polyvinyl chloride, Bakelite and polystyrene are some of the examples of polymers.
Answer to Problem 7QAP
The molar mass of styrene is largest of all and thus polystyrene has the largest molar mass.
Explanation of Solution
If all the polymers contain the same number of monomer units, the molar mass of polymers can be compared by comparing the molar mass of monomers in it.
(1)
In the table mentioned in the problem, the 1st polymer contains ethylene as a monomer unit. Ethylene consists of 2 carbon and 4 hydrogen atoms. The molar mass can be calculated as follows:
Putting the values,
(2)
The 2nd polymer shown in table consists of propylene as a monomer unit. Propylene consists of 3 carbon and 6 hydrogen atoms.
The molar mass can be calculated as follows:
Putting the values,
(3)
The 3rd polymer shown in table consists of vinyl chloride as monomer unit. Vinyl chloride consists of 2 carbon and 3 hydrogen and 1 chlorine atom.
Putting the values,
(4)
The 4th polymer shown in table consists of acrylonitrile as monomer unit. Acrylonitrile consists of 3 carbon, 3 hydrogen and 1 nitrogen atoms. The molar mass can be calculated as follows:
Putting the values,
(5)
The 5th polymer shown in table consists of styrene as monomer unit. Styrene consists of 8 carbon and 8 hydrogen atoms. The molar mass can be calculated as follows:
(6)
The 6th polymer shown in table consists of methyl methacrylate as monomer unit. Methacrylate consists of 2 carbon and 2 oxygen atoms. The molar mass can be calculated as follow:
Putting the values,
(7)
The 7th polymer shown in table consists of tetrafluoroethylene as monomer unit. Tetrafluoroethylene consists of 2 carbon and 4 fluorine atoms. The molar mass can be calculated as follows:
Putting the values,
The molar mass of styrene (5) is largest of all and thus polystyrene have the largest molar mass.
Thus, the molar mass of polystyrene is maximum.
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Chapter 23 Solutions
Chemistry: Principles and Reactions
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