5 Mg + 12 HNO3 ⇒ 5 Mg(NO3)2 + N2 + 6 H2O
<span>2FeCl3 + 3Zn = 2Fe + 3ZnCl<span>2
</span></span><span>6Li + 2H3PO4 = 2Li3PO4 + 3H2
</span><span>2FeCl3 + 3Mg = 2Fe + 3MgCl<span>2
</span></span><span>3Fe + 4H2O = Fe3O4 + 4H<span>2
</span></span><span>2Al(OH)3 = Al2O3 + 3H2O</span>
KOH+HNO3= KNO3+ H2O
2HCL+Zn(OH)2= ZnCl2+ 2H20
M(NaOH)1 = 250/0,1 = 25
m(р-ра) = 250+11 = 261
m(NaOH)2 = 25 + 11 = 36
w(NaOH) = 36/261 = 0,137 = 14%