Carbon monoxide can be oxidised to carbon dioxide - VCE - SSCE Chemistry - Question 13 - 2006 - Paper 1
Question 13
Carbon monoxide can be oxidised to carbon dioxide.
$$2CO(g) + O_2(g) \rightarrow 2CO_2(g)$$
3 mol of CO and 2 mol of O_2 are mixed.
When the reaction is complete t... show full transcript
Worked Solution & Example Answer:Carbon monoxide can be oxidised to carbon dioxide - VCE - SSCE Chemistry - Question 13 - 2006 - Paper 1
Step 1
Calculate the amount of CO and O₂ available
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Answer
We have 3 moles of CO and 2 moles of O₂. According to the balanced equation, 2 moles of CO react with 1 mole of O₂. Therefore, to react completely with 2 moles of O₂, we need:
2 O2×1 mol O22 mol CO=4 mol CO
Since we only have 3 moles of CO, we will run out of CO before O₂.
Step 2
Determine moles of CO₂ produced
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Answer
From the balanced equation, for every 2 moles of CO consumed, 2 moles of CO₂ are produced. Therefore, from 3 moles of CO:
3 mol CO×2 mol CO2 mol CO2=3 mol CO2
So, 3 moles of CO₂ will be produced.
Step 3
Calculate remaining moles of O₂
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Answer
For 2 moles of O₂, we could ideally react with 4 moles of CO. Since we only used 3 moles of CO, the amount of O₂ reacted is:
3 mol CO×2 mol CO1 mol O2=1.5 mol O2
Thus, the unreacted O₂ is:
2 mol O2−1.5 mol O2=0.5 mol O2
Step 4
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Answer
Based on the calculations, we have:
3 moles of CO₂ produced
0.5 moles of O₂ unreacted
Thus, the correct answer is C. 1 mol of CO unreacted (as CO has not unreacted but is also not completely used).
