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Chemistry 21 Online
OpenStudy (anonymous):

please help, What is the average binding energy per nucleon for a C-12 nucleus with a mass defect of 0.0993 amu? (1 amu= 1.66 x 10-27 kg; 1 J = 1 kg m2/s2) Answer 1.48 x 10-11 J 1.24 x 10-12 J 4.12 x 10-21 J 8.94 x 1015 J

OpenStudy (wolfe8):

Check this out: http://openstudy.com/study#/updates/51b17fcde4b06ee3ee277632

OpenStudy (anonymous):

ok

OpenStudy (anonymous):

I saw that actually. But, I don't understand. I was hoping I could find a simpler explanation??

OpenStudy (wolfe8):

First you change the mass from amu to kg

OpenStudy (wolfe8):

1) Convert mass from amu to kg 2) Use E=mc^2

OpenStudy (wolfe8):

3) Divide by number of nucleon

OpenStudy (anonymous):

Ok. Here this shows 0.0624 as the amu, is that what I would use with E=mc2?

OpenStudy (wolfe8):

No you have to change it to kg first, as I said. The post I linked showed you how to do that.

OpenStudy (anonymous):

1.03617629 × 10^-28 kg, does that look right?

OpenStudy (wolfe8):

Wait. Where did you get 0.0624 amu? The questions says 0.0993 amu

OpenStudy (anonymous):

Sorry, I got all of my equations on same page.

OpenStudy (anonymous):

1.64891515 × 10-28 kilograms this would be conversion for0.0993

OpenStudy (anonymous):

1.64891515 × 10^-28 kilograms

OpenStudy (wolfe8):

Yeah that looks right although our decimal points are different. Now you can use the formula E=mc^2

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