1. К -> КОН ->KHCO₃->K₂CO₃<span> -> КСI
</span>2К + 2H₂O= 2КОН + H₂↑
КОН + CO₂ = KHCO₃ + H₂O
KHCO₃+t = K₂CO₃ + CO₂↑ + H₂O
<span>или
</span>KHCO₃ + KOH = K₂CO₃ + H₂O
K₂CO₃ + 2HCI = 2КСI + CO₂↑ + H₂O
<span>
2. Ca ->Ca(OH)</span>₂ ->CaCl₂ ->CaCO₃->CaO->Ca(OH)₂
Ca + 2H₂O = Ca(OH)<span>₂ + H</span>₂↑<span>
</span>Ca(OH)<span>₂ + 2HCI = CaCl₂ + 2H</span>₂O<span>
</span>CaCl₂ + H₂CO₃ = CaCO₃↓ + 2HCI
<span>CaCO₃ + t = CaO + CO</span>₂↑<span>
</span><span>CaO+ H</span>₂O = <span>Ca(OH)₂</span>↓
кислород в воздухе- 20,93%==21%
в 100л воздуха 20,93 л== 21 л кислорода (O2)
BaCl2+AgNo3------ВаNo3+AgCl2
K2O+H2SO4 = K2SO4 + H2O
4 коэффициента
Ответ 4