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10 cards from this deck
Exact number of atoms of each element in one molecule
Simplest whole-number ratio of atoms of each element
H2,N2,O2\text{H}_2, \text{N}_2, \text{O}_2H2,N2,O2, halogens
Add up all ArA_rAr values in the molecular formula
Water of crystallisation as part of crystal structure
Water-free
n=mMn = \frac{m}{M}n=Mm
Separates compound formula from water molecules
Ensures all water is removed
Divide given MrM_rMr by empirical formula mass, then multiply
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