<u>2</u><em>Al</em> + <u>3</u><em>S</em> = <em>Al</em>2<em>S</em>3
n(S)=m/M=150/32=4.7моль
n(Al):n(S)2:3=4.7*2/3=4.13моль
<span>Ca+<span>2<span>H2IO</span></span> → <span>Ca<span>(OH)</span>2</span>+<span>H2
</span></span><span><span>Ca<span>(OH)</span>2</span>+<span>H2CO3</span> → <span>CaCO3</span> +<span>2<span>H2O
</span></span></span><span><span>CaCO3</span> → <span>CaO</span>+<span>CO2
</span></span><span><span>CaO</span>+<span>2<span>HCl</span></span> → <span>CaCl2</span>+<span>H2O
</span></span><span><span>Na2CO3</span> +<span>CaCl2</span> → <span>2<span>NaCl</span></span>+<span>CaCO<span>3
</span></span></span>
NO2 : азот = +4, кислород = -2
N2O3 : азот = +3, кислород = -2
N2O5 : азот = +5, кислород = -2
Na3N = натрий = +1, азот = -3
<span>2AL + 3CL2 = 2ALCL3
</span><span>2Fe + 3O2 = 2Fe2O3
</span><span>2AgBr = 2Ag + Br2</span>