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2014-06-02T21:17:15+03:00
Masa molara CuSO4=64+32+4*16=160g/mol=>1 mol CuSO4 cuprinde 160 g 
1 mol CuSO4.....160 g CuSO4
4 moli CuSO4.........x g CuSO4          x = 640 g CuSO4