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So there is a problem I can't understand why one gram of O and one gram of O2 includes same amount of oxygen atoms.

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  • $\begingroup$ Which of the following contains most oxygen atoms?a) 1,0 g O-atomeja, b) 1,0 g O2(g), c) 1,0 g O3(g). So there is clear question. And the right answer is that all of them includes same amount. And i don't understand how i can count this, because if i count in my way answer is wrong, $\endgroup$ Sep 19 '17 at 6:47
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    $\begingroup$ @paracetamol I guess I see your point, but this question somehow reminds me of "1kg of feathers vs 1kg of lead" problem:) $\endgroup$
    – andselisk
    Sep 19 '17 at 6:48
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    $\begingroup$ @Daria They all have the same number of atoms. Number of particles, will be different though ;) $\endgroup$ Sep 19 '17 at 6:48
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    $\begingroup$ @DariaKostiniuk No no, that's not what we meant. If it helps, one can show it analytically, e.g. presenting number of oxygen atoms as following: $$\begin{align}N(\ce{O}) &= n(\ce{O}) \times N_A = \\ &= \frac{x \times m(\ce{O_x}) \times N_A}{M(\ce{O_x})} = \\ &= \frac{x \times m(\ce{O_x}) \times N_A}{x \times M(\ce{O})} = \\ &= \mathrm{const}\end{align}$$ $\endgroup$
    – andselisk
    Sep 19 '17 at 7:00
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I think this question needs an eye-opener in non-chemical terms.

Counter-question: What contains more chestnuts?

a) 1 kg of "Cn" (chestnuts)

photo by Cornelia Kopp, https://flic.kr/p/N97ypT, CC BY

b) 1 kg of "Cn2"

b) 1 kg of "Cn3"

c) 1 kg of "Cn4"

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