Question

q.4. when the following equation is balanced, what is the coefficient for o₂? c₅h₁₂ + o₂ → co₂ + h₂o a) 8 b) 12 c) 14 d) 16

Explanation:

Step1: Balance carbon atoms

First, balance the carbon atoms. There are 5 carbon atoms in $C_5H_{12}$, so we need 5 moles of $CO_2$. The equation becomes $C_5H_{12}+O_2
ightarrow5CO_2 + H_2O$.

Step2: Balance hydrogen atoms

There are 12 hydrogen atoms in $C_5H_{12}$. Since each $H_2O$ molecule has 2 hydrogen atoms, we need 6 moles of $H_2O$. The equation is now $C_5H_{12}+O_2
ightarrow5CO_2+6H_2O$.

Step3: Balance oxygen atoms

On the right - hand side, there are $5\times2 + 6\times1=10 + 6 = 16$ oxygen atoms. So we need 8 moles of $O_2$ on the left - hand side to balance the oxygen atoms. The balanced equation is $C_5H_{12}+8O_2
ightarrow5CO_2+6H_2O$.

Answer:

A. 8