Question

what else is produced during the combustion of propane, c₃h₈?
c₃h₈ + 5o₂ → 3co₂ + 4____

○ h₂o
○ c₃h₈
○ o₂
○ c₃h₈o₂

Explanation:

Step1: Analyze Reactants and Products

Reactants: \( \text{C}_3\text{H}_8 \) (propane) and \( \text{O}_2 \) (oxygen). Products so far: \( 3\text{CO}_2 \). We need to balance the equation by considering hydrogen and oxygen atoms.

Step2: Balance Hydrogen Atoms

Propane (\( \text{C}_3\text{H}_8 \)) has 8 H atoms. Let the unknown product be \( \text{H}_2\text{O} \). For 8 H atoms, we need \( 4\text{H}_2\text{O} \) (since each \( \text{H}_2\text{O} \) has 2 H atoms: \( 4 \times 2 = 8 \)).

Step3: Check Oxygen Balance

Reactant O: \( 5\text{O}_2 = 10 \) O atoms. Product O: \( 3\text{CO}_2 \) has \( 3 \times 2 = 6 \) O, and \( 4\text{H}_2\text{O} \) has \( 4 \times 1 = 4 \) O. Total product O: \( 6 + 4 = 10 \), which matches reactant O. So the missing product is \( \text{H}_2\text{O} \).

Answer:

A. \( \text{H}_2\text{O} \)