Answer:
Explanation:
A 'mole' is the mass of substance that contains 1 Avogadro's Number of particles of that substance. This is equal to 1 formula weight of the substance. That is when thinking 'moles', think 'how many formula weights are there in the given mass?'
Example.
Given 100 grams of water (H₂O => formula weight = 18 grams/mole) ...
Ask 'how many 18's are there in 100?' => number of moles of H₂O... => 100/18 = 5.555... moles H₂O
This is the same for any substance => how many formula weights are there in the GIVEN mass? Always => #moles.
moles = mass(g)/formula wt(g·mol⁻¹)
