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mCoCl2=59u+2*35,5u=130u
mCoCl2*6H2O=130u+6*18u=238u
238g CoCl2*6H2O ------- 130g CoCl2
100g CoCl2*6H2O -------- xg CoCl2
x = 54,62g CoCl2
mCoCl2*6H2O = 238u
mCoCl2 = 130u
130u soli bezwodnej x
------------------------------ = ---------------
238u hydratu 100g hydratu
x = 54,62g