A sample of an iron ore was found to contain 36% of haematite (Fe2O3) and 20% of silica (SiO2) by mass. If 1.0 kg of this ore are reacted with excess carbon in a heater, calculate :
(a) The mass of iron metal that would be obtained. (Hints:carbon reacts only with haematite)
(b) The mass of CaO that would be required to change silica to slag (CaSiO3)
answer :
(a) 252g
(b) 186.7g.
詳細D~thx
F.4 Reacting masses--急...
2010-01-04 4:21 am
回答 (1)
2010-01-04 4:51 am
✔ 最佳答案
(a) % by mass of Fe in Fe2O3 = 2 x 55.8/(2 x 55.8 + 3 x 16) x 100% = 69.9 %Mass of Fe2O3 in ore = 360 g
With mass of iron = 360 x 69.9% = 252 g
(b) Mass of silica = 200g
With no. of moles = 200/(28 + 2 x 16) = 3.33
Hence no. of moles of CaO needed = 3.33
with mass = 3.33 x (40 + 16) = 186.7 g
參考: Myself
收錄日期: 2021-04-13 17:01:10
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