Calculating the energy of an atom based on antimatter annihilation

[DanTrentfield]

So say we have one atom of Helium, and one atom of anti-Helium, when they come into contact the total energy produced should be equal to this (If I didn't fudge on the calculations which is why I'm asking this): where mH is moles Helium, mAH is moles Anti-Helium, mMH is the molar mass of Helium, and mMAH is the molar mass of Anti-Helium. I just was bored so I decided to try to come up with a formula for calculating the total energy of an atom, and I chose helium for whatever reason. 

[swansont]

Yes, it's mc^2

the mass of matter and its antimatter partner is, as far as we know, equal

[DanTrentfield]

3 minutes ago, swansont said:

Yes, it's mc^2

the mass of matter and its antimatter partner is, as far as we know, equal

Hah! Thought I didn't screw up.