

Triệu Thị Hồng Diễm
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Hi Mai,
Thank you for messaging me and inviting me to your house. I'm very happy that you looked at my cookbook and are interested in it. On Sunday, I’m only free in the afternoon because I have an English class in the morning. Can I come around 2 PM? If possible, I will bring some fresh mangoes that day. My house still has a lot of fruits like apples and bananas... If you need anything to make cake, I can also bring that along. Also, I want us to make another cake that day to bring to Kieu, is that okay?
I hope to receive your answer soon. Thank you!
Diem
a) Fe + HNO3 --> Fe(NO3)3 + NO + H2O
Chất oxi hóa : HNO3 ; Chất khử : Fe
Quá trình khử : N+5 + 3e --> N+2 ( nhân 1) ; Quá trình oxi hóa : Fe0 --> Fe+3 + 3e (nhân 1)
Fe + 4 HNO3 --> Fe(NO3)3 + NO + 2 H2O
b) KMnO4 + FeSO4 + H2SO4 --> Fe2(SO4)3 + MnSO4 + K2SO4 +H2O
Chất oxi hóa : KMnO4 ; Chất khử : FeSO4
Quá trình khử : Mn+7 + 5e --> Mn+2 ( nhân 2) ; Quá trình oxi hóa : 2Fe+2 --> 2 Fe+3 + 2.1e (nhân 5)
2 KMnO4 +10 FeSO4 + 8H2SO4 --> 5Fe2(SO4)3 + 2MnSO4 + K2SO4 + 8H2O