The net reaction that accounts for the Sun’s power takes four neutral hydrogen atoms and fuses them to make a neutral helium atom, 4 ¹₁H→ ⁴₂He. Compute the energy released per hydrogen atom. The Sun’s total power output is L_⊙ ≅ 3.85 × 10²⁶W. How many protons per second are reacting in the Sun? Approximately 10%of the protons in the Sun will fuse during its stable hydrogen burning phase. Given the mass of the Sun,M_⊙ ≅ 1.99 × 10³⁰ kg, and the fact that about 75%by mass of the Sun is hydrogen (almost all the rest is helium), estimate how long the Sun’s hydrogen burning phase will last.