Posted by **Leila** on Wednesday, May 8, 2013 at 12:51pm.

Estimate the total binding energy for copper.

550 MeV

Estimate the energy, in joules, needed to break a 3.0g copper penny into its constituent nucleons.

E= in Joules

Please help me out I got 1st part I need the Energy in joules am confused please help me out...thanks

Physics - Elena, Wednesday, May 8, 2013 at 6:33am

Number of atoms is

N= N(A)m/μ =

=6.02210ēģ0.003/63.510⁻ģ=2.8510ēē.

Number of nucleons (protons+neutrons) =

=2.8510ēē63=1.810ē⁴.

Energy = 1.810ē⁴55010⁶1.610⁻đ⁹ =1.5810⁸ J

Thanks for the help but 1.58x10^8 J is wrong n I recalculated you calculation I got 1.58x10^14 J but that was also wrong so could you plz help me out.

- Physics to Elena -
**Elena**, Wednesday, May 8, 2013 at 3:16pm
I believe that the correct answer is 1.5810¹⁴ J.

- Physics to Elena -
**Leila**, Wednesday, May 8, 2013 at 3:49pm
Thatz what I got too but itz still wrong :/ I don't know why please help me...thanks

- Physics to Elena -
**Elena**, Wednesday, May 8, 2013 at 5:19pm
Number of nuclei

N=nN(A) = (m/μ) N(A)=

=(3 g)(6.02210²³ nuclei/mol)/(63 g/mol)=2.8710²² nuclei

The energy required to break all the copper nuclei into their constituent protons and

neutrons is

(550 MeV ) (2.8710²² nuclei) =1.5610²⁵ MeV =

=1.5610³¹eV =2.510¹² J

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