I think you transposed the numbers for mass proton on your post yesterday which may be the reason you had trouble getting the answer in the book. I've posted a response at the original post which can be found here.
http://www.jiskha.com/display.cgi?id=1394937578

To Nina - Nina, Wednesday, March 19, 2014 at 6:07am

Oh my, thank you so much for your help...! :)

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