In a star’s core the average mass number for ions which are not hydrogen or helium is 10. The mass fractions of hydrogen is 0.60, of helium is 0.38, and all other elements is 0.02. Calculate the average ion mass in units of mH.

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In a star’s core the average mass number for ions which are not hydrogen or
helium is 10. The mass fractions of hydrogen is 0.60, of helium is 0.38, and all other
elements is 0.02. Calculate the average ion mass in units of mH.

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