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The sun converts 1.91exp19 kg of Hydrogen to Helium per year, given that the sun started out with 75% Hydrogen by mass, computer how long the sun would shine if it converts all it's Hydrogen to Helium.

I computed the total energy of the sun as 3.81exp41 joules.

I tried subtracting the total energy of the sun from 75% of the energy from Hydrogen (computed using E=mc2) but that doesn't really add up. I computed the luminosity of the sun = 3.9exp26. I'm a little lost with this question can someone help me please.

thanks,