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    How am I supposed to answer this question - surely I don't have enough info?

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    Hmmmm yeah, looks like you don't have enough info. If you had the masses of the various particles you could calculate it easily using e = mc^2. I take it you weren't given them anywhere in the question/in a data book?

    The only suggestion I would have to solving this would be to use something called the semi-empirical mass formula. But that's well beyond sixth form.
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    This question was discussed in previous post here:

    http://www.thestudentroom.co.uk/show....php?t=2031964

    however the same conclusion was reached that there seems to be insufficient information.
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    Thnak you guys - SDA TSR won't let me thank you again yet!

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