Natural rubber is a polymer of isoprene (2-methyl-1,3-butadiene). If a rubber molecule has a mass of 68,000 amu, how many isoprene units are present?
Q1. Natural rubber is a polymer of isoprene (2-methyl-1,3-butadiene). If a rubber molecule has a mass of 68,000 amu, how many isoprene units are present?
Answer: 1000
Explanation: Isoprene (C5H8) has a mass of 68. Dividing 68,000 by 68 gives 1000 units. Option A incorrectly uses the mass of a saturated pentane unit.