SSCE HSC Chemistry Hydrocarbons: Which of the following is the co

Which of the following is the correct equation for an INCOMPLETE combustion of octane? (A) C$_8$H$_{18}$(l) + 8O$_2$(g) → 8CO(g) + 9H$_2$(g) (B) C$_8$H$_{18}$(l) + \frac{25}{2}O$_2$(g) → 8CO(g) + 9H$_2$O(l) (C) C$_8$H$_{18}$(l) + 6O$_2$(g) → 3CO(g) + 5C(s) + 9H$_2$O(l) (D) C$_8$H$_{18}$(l) + 13O$_2$(g) → 4CO(g) + 4C(s) + 9H$_2$O(l) - HSC - SSCE Chemistry - Question 7 - 2013 - Paper 1

Question 7

$Which-of-the-following-is-the-correct-equation-for-an-INCOMPLETE-combustion-of-octane?--(A)-C$_8$H$_{18}$(l)-+-8O$_2$(g)-→-8CO(g)-+-9H$_2$(g)--(B)-C$_8$H$_{18}$(l)-+-\frac{25}{2}O$_2$(g)-→-8CO(g)-+-9H$_2$O(l)--(C)-C$_8$H$_{18}$(l)-+-6O$_2$(g)-→-3CO(g)-+-5C(s)-+-9H$_2$O(l)--(D)-C$_8$H$_{18}$(l)-+-13O$_2$(g)-→-4CO(g)-+-4C(s)-+-9H$_2$O(l)-HSC-SSCE Chemistry-Question 7-2013-Paper 1.png$

Which of the following is the correct equation for an INCOMPLETE combustion of octane? (A) C$_8$H$_{18}$(l) + 8O$_2$(g) → 8CO(g) + 9H$_2$(g) (B) C$_8$H$_{18}$(l) +... show full transcript

Worked Solution & Example Answer:Which of the following is the correct equation for an INCOMPLETE combustion of octane? (A) C$_8$H$_{18}$(l) + 8O$_2$(g) → 8CO(g) + 9H$_2$(g) (B) C$_8$H$_{18}$(l) + \frac{25}{2}O$_2$(g) → 8CO(g) + 9H$_2$O(l) (C) C$_8$H$_{18}$(l) + 6O$_2$(g) → 3CO(g) + 5C(s) + 9H$_2$O(l) (D) C$_8$H$_{18}$(l) + 13O$_2$(g) → 4CO(g) + 4C(s) + 9H$_2$O(l) - HSC - SSCE Chemistry - Question 7 - 2013 - Paper 1

Step 1

Correct equation for an INCOMPLETE combustion of octane

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Answer

For incomplete combustion of octane (C₈H₁₈), the products typically include carbon monoxide (CO) and water (H₂O) along with unburned carbon (C). The correct balanced equation is:

$C_8H_{18}(l) + 6O_2(g) → 3CO(g) + 5C(s) + 9H_2O(l)$

Thus, the correct answer is (C).

Correct equation for an INCOMPLETE combustion of octane

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