Question

There are two molecules with the formula C3H6. Propene (H2C=CH-CH3)is the monomer of the polymer polypropylene, which is used for indoor-outdoor carpets. Cyclopropane is used as an anesthetic.

When heated to 499 °C, cyclopropane rearranges (isomerizes) and forms propene with a rate constant of 3.57 × 10–2 min–1. The reaction is first order with respect to propene concentration. What fraction of the cyclopropane remains after 45 min at 499.5 °C?

0.20

1.606

4.98

0.80