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a).M CaSO4 * 2H2O=40u + 32u + 4*16u + 2*(2u+16u) = 172u
b).M CuSo4 * 5H2O= m Cu+ mS+4* mO+ 10* mH+ 5*mO=64u+32u+64u+10u+80u=250u
c).M CoCl2 * 6H2O = 28u + 35u + 6(1u*2 + 16u) = 28u + 35u + 10 * 18u = 28u + 35u + 180u = 243u
Pozdrawiam.Mam nadzieje że pomogłam. :-)