When charcoal reacts in the presence of oxygen, carbon monoxide and carbon dioxide are produced according to the following chemical reactions.
2C(s) + O
2(g) → 2CO(g)
C(s) + O
2(g) → CO
2(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?
A) 0.93 kg
B) 1.2 kg
C) 1.5 kg
D) 2.5 kg
Answer: B
- Equal amounts are consumed i.e. 200 g of C undergoes each reaction
No. of moles of C reacted in each reaction = 200/12 = 16.67 mol
No. of moles of CO formed = 16.67 mol
Mass of CO formed = 16.67 x (12+16) = 466.67 g
No. of moles of CO2 formed = 16.67 mol
Mass of CO2 formed = 16.67 x (12+16x2) = 733.33 g
Total mass of gas formed = 1200 g = 1.2 kg
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