Answer :
CNO cycle uses carbon as catalyst in which carbon is used in the reaction but in the end the carbon is returned to be used again
What is CNO cycle?
- CNO cycle full form carbon-nitrogen-oxygen cycle sequence of thermonuclear reactions which provides most of the energy radiated by the hotter stars.
- It is a process of stellar nucleosynthesis in which stars on Main Sequence fuse hydrogen into helium via a six-stage sequence of reactions
The sequence is as follows:
- Carbon-12 nucleus captures a proton and emits gamma ray, producing nitrogen-13.
- Nitrogen-13 is unstable and emits beta particle decaying to carbon-13.
- Carbon-13 captures a proton and becomes nitrogen-14 via emission of gamma-ray.
- Nitrogen-14 captures another proton and becomes oxygen-15 by emitting gamma-ray.
- Oxygen-15 becomes nitrogen-15 via a beta decay.
- Nitrogen-15 captures a proton and produces a helium nucleus and carbon-12 which is where the cycle started.
¹²C + ¹H → ¹³N + γ
¹³N → ¹³C + e⁺ + ν
¹³C + ¹H →¹⁴N + γ
¹⁴N + ¹H → ¹⁵O + γ
¹⁵O →¹⁵N + e⁺ + ν
¹⁵N + ¹H → ¹²C + ⁴He
The carbon-12 nucleus used in initial reaction is regenerated in the final one and hence acts as catalyst for the whole cycle
Learn more about CNO cycle at https://brainly.com/question/13549590
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