When coal is heated without air access, coke is formed. How much air is required to burn 1000 kg

| July 26, 2021 | education

When coal is heated without air access, coke is formed. How much air is required to burn 1000 kg of coke containing 5% impurities.

1. Let’s write the equation of chemical transformations:

C + O2 = CO2.

2. Find the mass of pure coke without impurities, and then convert it into the amount of substance:

ω (C) pure = 100% – ω (C) impurities = 100% – 5% = 95%.

m (C) = m (mixture) * ω (C) pure / 100% = 1,000,000 g * 95% / 100% = 950,000 g.

n (C) = m (C) / M (C) = 950,000 g / 12 g / mol = 79166.67 mol.

3. According to the reaction equation, we find the amount of required oxygen, and at the end the volume of required air:

n (O2) = n (C) = 79166.67 mol.

V (O2) = n (O2) * Vm = 79166.67 mol * 22.4 l / mol = 177333.33 l = 177.33 m3.

V (air) = V (O2) * 100% / ω (O2) = 177.33 m3 * 100% / 23% = 771 m3.

Answer: V (air) = 771 m3.



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