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.

  • $\begingroup$ 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, $\endgroup$ – Daria Kostiniuk 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 ;) $\endgroup$ – paracetamol Sep 19 '17 at 6:48
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    $\begingroup$ @Daria Just because it didn't "click" immediately doesn't make you stupid. The question's just meant to check your proficiency in the whole stoichiometry/mole thingy...we all screw up the when we start O:) $\endgroup$ – paracetamol Sep 19 '17 at 6:55
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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

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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    $\begingroup$ You've clearly had fun while making this answer. +1 :D $\endgroup$ – paracetamol Sep 19 '17 at 13:22
  • $\begingroup$ Isn't Cn, Copernicium? Rather less tasty and healthy. $\endgroup$ – badjohn Sep 19 '17 at 14:34
  • $\begingroup$ @bad Yeah, but (obviously) for the purposes of this answer, we're dealing with Chestnutium and its mono-nut, di-nut, tri-nut and tetra-nut forms ;) $\endgroup$ – paracetamol Sep 19 '17 at 16:35
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    $\begingroup$ @paracetamol I will confess that I have never tasted Copernicium so I cannot really say whether it tastes good or bad. On the other hand, I can confirm that Chestnutium tastes good; it was even known to the alchemists. $\endgroup$ – badjohn Sep 19 '17 at 16:59

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