2<span>H3PO4</span><span> + </span>3<span>Fe(NO3)2</span><span> = </span><span>Fe3(PO4)2</span><span> + </span>6<span>HNO<span>3</span></span>
M(C2H3Cl)= 12*2 + 3 + 35.5 = 36 + 38.5 = 74.5 г/моль
W(C) = 36/74.5 = 48.3%
W(H) = 3/74.5 = 4.03%
W(Cl) = 100% - 48.3% - 4.03% = 47.67%
Аl2O3 +2 KOH =2KAlO2 + H2O
Al(OH)3 + KOH = KAlO2 +2H2O
Na+2HCl =2 NaCl + H2