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The mole is a standard amount of a substance A mole of a substance is a number of units (particles, atoms, molecules, ions, peas, hard candies, people, universes) equal to the number of atoms of carbon-12 in one gram of carbon-12, or an Avogadro's number of stuff. The mole allows us to relate real-word measurements to atomic scale phenomena.

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In this case you only have one variable to solve for ($x$) and you have one piece of information (Zn being 21.5% by mass) so you have enough information to solve the question. The molecular mass of t …
answered Sep 10 '18 by orthocresol
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The molar volume $V_\mathrm{m}$ is the volume of a substance per mole of substance. This is different from the "volume of one mole of substance". For example, the volume of one mole of water is … approximately $18~\mathrm{cm^3}$. But the molar volume of water should be $18~\mathrm{cm^3~mol^{-1}}$. Saying that the molar volume is the "volume of one mole of substance" is incorrect, just like …
answered Nov 28 '16 by orthocresol
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The term you are looking for is formula unit, I think. Wikipedia doesn't really describe it super well, but just to give an example, you could write the sentence $\pu{58.44 g}$ of $\ce{NaCl}$ cont …
answered Sep 11 '17 by orthocresol