Молярная масса в-ва: 2,707*М(воздуха)=2,707*29= 78,5 г/моль
1)Б
2)А
3)А
4)Б
5)Г
6)А
7)В
8)А
9)А
10)А
<span>2Al+3Br</span>₂⇒<span>2AlBr</span>₃<span>
Pb+2O</span>₂⇒<span>PbO</span>₄<span>
6FeO+O</span>₂⇒<span>2Fe</span>₃<span>O</span>₄<span>
Zn+HCl</span>⇒<span>ZnCl</span>₂<span>+H</span>₂↑<span>
C</span>₂<span>H</span>₆<span>+O</span>₂⇒<span>CO</span>₂↑<span>+H</span>₂<span>O
PbCl</span>₂<span>+Na</span>₂<span>S</span>⇒<span>PbS</span>↓<span>+2NaCl</span>