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A star converts all its hydrogen to heli...

A star converts all its hydrogen to helium, achieving 100% helium composition. It then converts the helium to carbon via the reaction `._2He^4 + ._2He^4+ ._2He^4 to._6C^(12)+7.27MeV`
The mass of the star is `5.0xx10^(32)kg` and it generates energy at the rate of `5xx10^(30)kg` watt. How long will it take to convert all the helium to carbon at this rate?

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