[Charries]

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

[3nTr0pY]

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.

[SDA]

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.

[Charries]

Thnak you guys - SDA TSR won't let me thank you again yet!