Calculate the mass of chromium that can be obtained by the aluminothermic method from 20 kg
| May 29, 2021 | education
Calculate the mass of chromium that can be obtained by the aluminothermic method from 20 kg of ore containing chromium (III) oxide and 12% of other impurities.
The content of impurities in 20 kg of ore is 12% or 0.12 × 20 = 2.4 kg.
The mass of chromium oxide Cr2O3 is: 20 – 2.4 = 17.6 kg.
The molar mass of chromium (III) oxide: M (Cr2O3) = 52 × 2 + 16 × 3 = 152 g / mol, including chromium: 52 × 2 = 104 g / mol.
The mass of chromium that can be obtained by the aluminothermic method from 20 kg of ore:
17.6 × 104/152 = 12.04 kg.
Answer: 12.04 kg.
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