Câu 8/Hoàn thành các phương trình sau: KMnO4 -> A + B + X ↑ Fe + HCl -> C + Y ↑ Fe + Cl2 -> D Fe + O2 -> E E + HCl ->C + D + H2O Cho biết Fe + Cl2 --> FeCl3 Câu 9) Cho các chất: Na, H2O, CaCO3, KClO3, P và các điều kiện cần thiết khác. Viết PTHH để điều chế: NaOH, Na3PO4, CO2, H3PO4.
2 câu trả lời
Câu 8:
`\text{2KMnO}_4` $\xrightarrow{\text{t}^o}$ `\text{MnO}_2 + \text{K}_2\text{MnO}_4 + \text{O}_2↑`
`\text{Fe} + 2\text{HCl}` $\xrightarrow{\text{t}^o}$ `\text{FeCl}_2 + \text{H}_2`
`\text{2Fe} + \text{3Cl}_2` $\xrightarrow{\text{t}^o}$ `\text{2FeCl}_3`
`\text{3Fe} + \text{2O}_2` $\xrightarrow{\text{t}^o}$ `\text{Fe}_3\text{O}_4`
`\text{Fe}_3\text{O}_4 + \text{8HCl}` $\xrightarrow{\text{t}^o}$ `\text{2FeCl}_2 + \text{FeCl}_3 + \text{4H}_2\text{O}`
Câu 9:
`\text{2Na} + \text{2H}_2\text{O} -> \text{2NaOH}` `+` `\text{H}_2`
`\text{CaCO}_3` $\xrightarrow{\text{t}^o}$ `\text{CaO}` `+` `\text{CO}_2`
`\text{2KClO}_3` $\xrightarrow{\text{t}^o}$ `\text{2KCl}` `+` `\text{3O}_2`
`\text{4P} + \text{5O}_2` $\xrightarrow{\text{t}^o}$ `\text{2P}_2\text{O}_5`
`\text{P}_2\text{O}_5 + \text{3H}_2\text{O} -> \text{2H}_3\text{PO}_4`
2KMnO4 -> MnO2 + K2MnO4+ O2 ↑
Fe +2HCl -> FeCl2 + H2
2Fe+3Cl2->2FeCl3
3Fe+2O2->Fe3O4
Fe3O4+8HCl->2FeCl2+FeCl3+4H2O
câu 9
2Na+2H2O-->2NaOH+H2
CaCO3-to->CaO+CO2
2KClO3-to->2KCl+3O2
4P+5O2-to->2P2O5
P2O5+3H2O-->2H3PO4