2Zn + O2 = 2ZnO;
ZnO2 + H2O = Zn(OH)2;
3Zn(OH)2 + 2H3PO4 = Zn3(PO4)2 + 6H2O;
Zn3(PO4)2 + 6HNO3 = 3Zn(NO3)2 + 2H3PO4;;
Zn(NO3)2 + H2SO4 = ZnSO4 + 2HNO3.
Дано
m(ppa NH2-CH2-COOH) = 200 g
w(NH2CH2COOH) = 15%
+KOH
------------------------------------------
m(NH2CH2COOK)-?
m(NH2CH2COOH) = 200*15% / 100% = 30 g
30 X
NH2CH2COOH+KOH-->NH2CH2COOK+H2O
75 113
M(NH2CH2COOH) = 75 g/mol
M(NH2CH2COOK) = 113 g/mol
X = 30*113 / 75 = 45.2 g
ответ 45.2 г