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Mass in grams of one mole of a substance
MMM, unit: g⋅mol−1\text{g} \cdot \text{mol}^{-1}g⋅mol−1
Take ArA_rAr from periodic table, add g⋅mol−1\text{g} \cdot \text{mol}^{-1}g⋅mol−1
Add up relative atomic masses of all atoms in formula
n=mMn = \frac{m}{M}n=Mm (nnn=mol, mmm=mass in g, MMM=molar mass)
m=n×Mm = n \times Mm=n×M
18.0 g⋅mol−118.0 \text{ g} \cdot \text{mol}^{-1}18.0 g⋅mol−1
44.0 g⋅mol−144.0 \text{ g} \cdot \text{mol}^{-1}44.0 g⋅mol−1
6.02×1023 mol−16.02 \times 10^{23} \text{ mol}^{-1}6.02×1023 mol−1
N=n×NAN = n \times N_AN=n×NA where NNN=particles, NAN_ANA=Avogadro constant
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