You must realize that one proton free, lonely, has not the same mass as when included in a nucleus. A proton looses a small part of its mass when entering a nucleus. This mass loss is transformed into energy through the Einstein law : E = mc2.
This is a question worth debating and discussion. First of let us realize the fact that we are used to looking at relative atomic weights or masses (if someone wants to be too accurate). No Table lists the absolute atomic masses of atoms in the periodic table, i.e., through out the history we have to assumed either the weight of hydrogen atom is exactly 1....
Well, I understand it, but I don't like it. There's an error in line 5 of eq 5.
When you subtract the two equations, put everything in writing:
0.0556x + 0.0377y - 0.0566x -0.0566y = 0.366 - 0.535
Then -0.0189y = -0.169, (not 0.0377y = 0.169)
Then y = 8.94g (Fe) (answer)
(And incidentally, x + y = 9.62g, so x = 0.68g (Al))
I sympathize with you - ...
"How can it remain secret?". Trivial answer is - it can't (it isn't).
WD40 is a Fast Moving Consumer Good (FMCG). It is also a reasonably cheap product - as an industrial chemist this suggests at least two things to me:
It doesn't contain anything rare or expensive
It isn't difficult to manufacture
As an ex-petroleum chemical analyst, with access to a ...