<span>6Li+N</span>2<span> = 2Li3N</span>
<span>Ai2O3+6Na = 3Na2O+2Ai</span>
<span>2SO2+O2 = 2SO3</span>
<span>2HCI+Cu(OH)2 = CuCI2 +2H2O</span>
1)уксусная
1дм3 = 1 л
n(HCl) = 250/22,4 = 11,16 моль
m(HCl) = 11,16* 36,6 = 407,37 г
m раствора =407,37 +1000 =1407,37 г
w = 407,37/1407,37 =0,289 или 28,9%