Question

--Given Values-- - = Data for Problem 1 Molecular Weight Data Table for = Poly(ethelyne terephthalate) (PET, a polyester) = Molecular Wt(g/mol)|----xi--- |-- wi - = 8,000 - 16,000 - = 16,000 - 24,000 0.03 ----0.04 0.16 ----0.12 - = 24,000 - 32,000 ----- 0.25 ----0.20 - = 32,000 - 40,000 0.29 ----0.28 - = 40,000 - 48,000 --- 0.19 --|--0.29 - = 48,000 - 56,000------|-- 0.08 --|--0.13 Poly(ethylene terephthalate) (PET, a polyester)

          --Given Values--
- = Data for Problem 1
Molecular Weight Data Table for = Poly(ethelyne terephthalate) (PET, a polyester)
= Molecular Wt(g/mol)|----xi--- |-- wi
- 
= 8,000 - 16,000
- 
= 16,000 - 24,000
0.03 ----0.04
0.16 ----0.12
- 
= 24,000 - 32,000
----- 
0.25 ----0.20
- 
= 32,000 - 40,000
0.29 ----0.28
- 
= 40,000 - 48,000
--- 0.19 --|--0.29
- 
= 48,000 - 56,000------|-- 0.08 --|--0.13
Poly(ethylene terephthalate)
(PET, a polyester)

–Given Values–
- = Data for Problem 1
Molecular Weight Data Table for = Poly(ethelyne terephthalate) (PET, a polyester)
= Molecular Wt(g/mol)|—-xi— |– wi
-
= 8,000 - 16,000
-
= 16,000 - 24,000
0.03 —-0.04
0.16 —-0.12
-
= 24,000 - 32,000
—–
0.25 —-0.20
-
= 32,000 - 40,000
0.29 —-0.28
-
= 40,000 - 48,000
— 0.19 –|–0.29
-
= 48,000 - 56,000——|– 0.08 –|–0.13
Poly(ethylene terephthalate)
(PET, a polyester)

Added by Sherri J.

University Physics with Modern Physics

Hugh D. Young 14th Edition

Instant Answer

Solved by Expert Prabhat Tyagi

Step 1

To calculate Mn, we need to multiply each molecular weight range (xi) by its corresponding number fraction (Ni), and then sum up all the values. Mn = (8000-16000) * 0.03 + (16000-24000) * 0.16 + (24000-32000) * 0.25 + (32000-40000) * 0.29 + (40000-48000) * 0.19 Show more…

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Problem 1 Part A: For the polymer listed, given the mass range in (g/mol) and Ni (number fraction) and wi (weight fraction), compute the number-average molecular weight for the polymer. Your Answer = Problem 1 Part B: Calculate the weight-average molecular weight for the polymer. Your Answer = Problem 1 Part C: Find the degree of polymerization for the polymer listed. Your Answer = --Given Values-- Data for Problem 1 Molecular Weight Data Table for Poly(ethylene terephthalate) (PET), a polyester Molecular Wt (g/mol) | xi | wi 8,000-16,000 | 0.03 | 0.04 16,000-24,000 | 0.16 | 0.12 24,000-32,000 | 0.25 | 0.20 32,000-40,000 | 0.29 | 0.28 40,000-48,000 | 0.19 | 0.29 48,000-56,000 | 0.08 | 0.13