The amount of weight percent sulfur.
Answer to Problem 79AAP
The amount of weight percent sulfur is
Explanation of Solution
Show the chemical structure bonding of polybutadiene and polystyrene as:
Express the weight per cent of sulfur.
Here, the molar mass of the sulfur is
Calculate the mass of sulfur at 20%.
Here, the number of mole in butadiene is
Calculate the copolymer total mass.
Here, the molar mass of the polybutadlene is
Conclusion:
The average molecular mass of the polylstyrene is
The average molecular mass of the polybutadlene is
The average molecular mass of the sulfur is
Substitute
Calculate the fraction of butadlene.
Calculate the number of moles of butadlene using 100 g of copolymer.
Substitute 1.45 g for mole butadlene and
Substitute 9.28 g for
Thus, the amount of weight percent sulfur is
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Chapter 10 Solutions
Foundations of Materials Science and Engineering
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