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mCoCl₂ = mCo + 2 · mCl
mCo = 59 u
mCl = 35,5 u
mCoCl₂ = 59 u + 2 · 35,5 u = 130 u
mH₂O = 2 · mH + mO
mH = 1 u
mO = 16 u
mH₂O = 2 · 1 u + 16 u = 18 u
mCoCl₂ · 6 H₂O = 130 u + 6 · 18 u = 130 u + 108 u = 238 u