Hi Anna, That’s wonderful to hear! I’d love to come over this Sunday and try some recipes with you. Don’t worry, I’ll bring plenty of fresh mangoes from the garden. Really looking forward to it—it will be delicious and fun! Hugs, Linda

Hi Anna, That’s wonderful to hear! I’d love to come over this Sunday and try some recipes with you. Don’t worry, I’ll bring plenty of fresh mangoes from the garden. Really looking forward to it—it will be delicious and fun! Hugs, Linda

Hi Anna,

That’s wonderful to hear! I’d love to come over this Sunday and try some recipes with you. Don’t worry, I’ll bring plenty of fresh mangoes from the garden. Really looking forward to it—it will be delicious and fun!

Hugs, Linda

a,

Chất khử: Fe; chất oxi hoá: HNO3

Quá trình oxi hoá: 0Fe → +3Fe + 3eFe0 → Fe+3 + 3e

- Quá trình khử: +5N + 3e → +2N

1×1×∣∣ ∣∣0Fe → +3Fe + 3e+5N+3e→+2N

Fe + 4HNO3 →→ Fe(NO3)3 + b,

Chất khử: FeSO4; chất oxi hóa: KMnO4

Quá trình oxi hóa: 2+2Fe→2+3Fe+2e2Fe+2→2Fe+3+2e

- Quá trình khử: +7Mn+5e→+2Mn

5×2×⎛⎜⎝2+2Fe→2+3Fe+2e+7Mn+5e→+2Mn⎞⎟⎠

10FeSO4 + 2KMnO4 + 8H2SO4 → 5Fe2(SO4)3 + K2SO4 + 2MnSO4 + 8H2ONO + 2H2O.

a,

K+7MnO4+Ca+3C2O4+H2SO4 +CaSO4+K2SO4++2MnSO4

++4C

(5×1×)+3C→+4C+1e+7Mn+5e→+2Mn

5CaC2O4 + 2KMnO4 + 8H2SO4 → 5CaSO4 + K2SO4 + 2MnSO4 + 10CO2↑ + 8H2O

b,

Số mol KMnO4 cần dùng để phản ứng hết với calcium oxalate kết tủa từ 1 mL

máu là: 10-6 mol

Xét sơ đồ:

2KMnO4→5CaSO410−6mol→2,5×10−6mol

Khối lượng ion calcium (mg) trong 100 mL máu là:

2,5×10−6×40×103×100=10mg/100mL2,5×10−6×40×103×100=10mg/100mL.

=-542,83-167,16-(-795,00)=85,08 kj