How many ozone molecules can be destroyed by one atom of chlorine from CFCs?

• A. 10,000 molecules
• B. 100,000 molecules
• C. 1,000 molecules
• D. 50,000 molecules

Answer: (B)

One atom of chlorine can lead to the destruction of a significant number of ozone molecules due to the catalytic nature of the reaction. Chlorine, often released from chlorofluorocarbons (CFCs), can initiate a chain reaction in the stratosphere where it reacts with ozone (O3) and converts it into oxygen (O2). This chlorine atom can subsequently react with additional ozone molecules, continuing the cycle.

In a typical scenario, one chlorine atom can destroy around 100,000 ozone molecules before it is ultimately removed from the atmosphere. This high destruction capacity is what makes CFCs particularly harmful to the ozone layer. The destruction occurs because a single chlorine atom can repeatedly react and contribute to the breakdown of ozone for many cycles, highlighting the significant environmental impact of these substances.