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Să se afle masa de CuSo4 in care se gasesc 640gCu

Răspuns :

MCuSO4= 64+32+4.16=160--------->1mol=160 g                                                           160g CuSO4------------64g Cu                                                                                           xg------------------------640g Cu                                                                                        x=160.640:64=1600g CuSO4