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 =

=6.022•10²³•0.003/63.5•10⁻³=2.85•10²².

Number of nucleons (protons+neutrons) =

=2.85•10²²•63=1.8•10²⁴.

Energy = 1.8•10²⁴•550•10⁶•1.6•10⁻¹⁹ =1.58•10⁸ 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 1.58•10¹⁴ 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=n•N(A) = (m/μ) • N(A)=

=(3 g)•(6.022•10²³ nuclei/mol)/(63 g/mol)=2.87•10²² nuclei

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

neutrons is

(550 MeV ) •(2.87•10²² nuclei) =1.56•10²⁵ MeV =

=1.56•10³¹eV =2.5•10¹² J

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