Chemistry · Determination of molecular mass using colligative properties, abnormal value of molar mass, van't Hoff factor and its significance
Assertion: value is always greater than value for synthetic polymers. Reason: Th
Assertion: \( \bar{M}_{n} \) value is always greater than \( \bar{M}_{w} \) value for synthetic polymers. Reason: The mass average molecular weight of the polymer is equal to \( \bar{M}_{w} \)
- A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
- B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
- C. Assertion is correct but Reason is incorrect
- D. Assertion is incorrect but Reason is correct
Step-by-step solution
For synthetic polymers, the weight average molecular weight (M_w) is always greater than or equal to the number average molecular weight (M_n), not the other way around. The assertion is false. The reason correctly states that M_w is the mass average molecular weight.