1) Сu SO4 * 5H2O
160 : 90
16 :9
m(CuSO4)в купоросе =[20 :(16+9) *16=12,8г; n(CuSO4)=12,8 :160=0,08моль;
2) 2Na+2HOH=2NaOH+H2
1 1
0,08 0,16
CuSO4+2NaOH=Cu(OH)2+Na2SO4
1 2
n(Na)=0,16моль; m(Na)=0,16*23=3,68г.
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