# Binding energy of C12

**1. The problem statement, all variables and given/known data**

Given that the mass of 1 H is 1.00794 amu, the mass of a neutron is 1.00865 amu and

that the energy equivalent of 1 atomic mass unit (AMU) is 931.5 MeV, what is the

binding energy of 12C (atomic mass = 12.00000 amu)?

**2. Relevant equations**

(σ) mass decrement=(W) mass of constituent particles (aka for helium 4 its 4p+4n+4e) – (M) actual mass of atom

E=σ*c^2

**3. The attempt at a solution**

I want to find the binding energy of carbon 12. So it’s σ=W-12. W is 6p+6n+6e. I know the mass of n. But I do not know the mass of p and e.

I am told that 1H=1.00794 amu. So 1.00794=1p+1e-σ. I don’t see how this helps me get values for p and e. Help?

http://ift.tt/1bH0Fjd

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