50cm of carbon (II) oxide exploded with 150cm 3 of air containing 20% oxygen by
CHEMISTRY
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50cm of carbon (II) oxide exploded with 150cm3 of air containing 20% oxygen by volume. Which of the reactants was in excess?
- A) carbon (II) oxide
- B) carbon (IV) oxide
- C) oxygen
- D) nitrogen
Correct Answer: C) oxygen
Explanation
2CO + O\(_2\) \(\rightarrow\) 2CO\(_2\)
50cm\(^3\) \(\rightarrow\) 25cm\(^3\)
20% \(\times\) 150cm\(^3\)
30cm\(^3\) is the volume of oxygen available for the reactions.
But only 25cm\(^3\) is required, therefore O\(_2\) is in excess.
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