Whencharcoal reacts in the presence of oxygen, carbon monoxide and carbon dioxide are produced according to the following chemical reactions?

[匿名]

2017-10-30 12:44 am

When charcoal reacts in the presence of oxygen, carbon monoxide and carbon dioxide are produced according to the following chemical reactions.
C(s) + 2 O2(g) → CO(g)
C(s) + O2(g) → CO2(g)

What would be the total mass of gas produced when 400 g of charcoal is reacted,
assuming equal amounts are consumed in each reaction?

im so confused please help and explain

回答 (1)

micatkie

2017-10-30 12:57 am

✔ 最佳答案

The equation for the production of CO should be "2 C(s) + O₂(g) → 2 CO(g)" instead.

Molar mass of C = 12.0 g/mol
Molar mass of CO = (12.0 + 16.0) g/mol = 28.0 g/mol
Molar mass of CO₂ = (12.0 + 16.0×2) g/mol = 44.0 g/mol

Consider the production of CO :
2 C(s) + O₂(g) → 2 CO(g)
Mole ratio C : CO = 2 : 2 = 1 : 1
Mass of C consumed = (400 g) / 2 = 200 g
No. of moles of C consumed = (200 g) / (12 g/ mol) = 16.67 mol
No. of moles of CO produced = 16.67 mol
Mass of CO produced = (16.67 mol) × (28 g/mol) = 466.76 g

Consider the production of CO₂ :
C(s) + O₂(g) → CO₂(g)
Mole ratio C : CO₂ = 1 : 1
Mass of C consumed = (400 g) / 2 = 200 g
No. of moles of C consumed = (200 g) / (12 g/ mol) = 16.67 mol
No. of moles of CO₂ produced = 16.67 mol
Mass of CO₂ produced = (16.67 mol) × (44 g/mol) = 733.48 g

Total mass of gas produced = (466.76 + 733.48) g = 1200.24 g ≈ 1200 g

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