convert the mass of a compound to the number of particles( and vice versa)? 

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jerichorayel | College Teacher | (Level 2) Senior Educator

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For this type of problem, we use the molar mass and avogadros number in order to solve the question. 

Mass of compound -> Moles compound -> number of particles

this step is vice versa.

Let me show you an example.

100 grams of NaCl


100 grams NaCl -> moles NaCl -> number of particles

`100 g NaCl x ((1mol NaCl)/(58.44gmol-1)) x ((6.022x10^23 particl es)/(1 mol NaCl))`



= 1.0305x10^24 particles


Now to work on from particles to the molar mass of compound, you just have to reciprocate the values. For example 2.00x10^24 atoms/particles of gold

`2.00x10^(24) particl es Au x ((1mol e Au)/(6.022x10^23 particl es)) x ((196grams)/(1mol e Au))`

= 654 grams of gold (Au)


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