For the reduction of 240 g of magnesium oxide, 80 g of coal were consumed: MgO + C = Mg
September 23, 2021 | education
| For the reduction of 240 g of magnesium oxide, 80 g of coal were consumed: MgO + C = Mg + CO What is the mass fraction of pure carbon in this coal?
1. Let’s write down the reaction equation:
MgO + C = Mg + CO.
2. Find the amount of magnesium oxide:
n (MgO) = m (MgO) / M (MgO) = 240 g / 40 g / mol = 6 mol.
3. Using the equation, we find the amount of pure coal and the mass:
np (C) = n (MgO) = 6 mol.
mh (C) = n (C) * M (C) = 6 mol * 12 g / mol = 72 g.
4. Let’s find the mass fraction of pure coal:
ω (C) = (mh (C) / mth (C)) * 100% = (72 g / 80 g) * 100% = 90%.
Answer: 90%.
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