# Why one gramm of O and one gramm of O2 icludes same amount of oxygen atoms? [closed]

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.

• 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, Sep 19 '17 at 6:47
• @paracetamol I guess I see your point, but this question somehow reminds me of "1kg of feathers vs 1kg of lead" problem:) Sep 19 '17 at 6:48
• @Daria They all have the same number of atoms. Number of particles, will be different though ;) Sep 19 '17 at 6:48
• @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} Sep 19 '17 at 7:00
• Sep 19 '17 at 13:26