Question

question 18
1 pts
which of the following is a balanced equation representing the complete decomposition of acetone, c₃h₆o?
2 c₃h₆o --> 6 c + 6 h₂ + o₂
c₃h₆o --> c₃h₆ + o₂
c₃h₆o --> ch₂ + o
c₃h₆o --> co₂ + h₂o

Explanation:

Step1: Check atom - count for each equation

For the equation $2C_{3}H_{6}O
ightarrow6C + 6H_{2}+O_{2}$:
On the left - hand side, for 2 moles of $C_{3}H_{6}O$, we have $2\times3 = 6$ carbon atoms, $2\times6=12$ hydrogen atoms and $2\times1 = 2$ oxygen atoms.
On the right - hand side, we have 6 carbon atoms, $6\times2 = 12$ hydrogen atoms and 2 oxygen atoms.
For the equation $C_{3}H_{6}O
ightarrow C_{3}H_{6}+O_{2}$:
On the left - hand side, we have 3 carbon atoms, 6 hydrogen atoms and 1 oxygen atom. On the right - hand side, we have 3 carbon atoms, 6 hydrogen atoms and 2 oxygen atoms. This is not balanced.
For the equation $C_{3}H_{6}O
ightarrow CH_{2}+O$:
On the left - hand side, we have 3 carbon atoms, 6 hydrogen atoms and 1 oxygen atom. On the right - hand side, we have 1 carbon atom, 2 hydrogen atoms and 1 oxygen atom. This is not balanced.
For the equation $C_{3}H_{6}O
ightarrow CO_{2}+H_{2}O$:
On the left - hand side, we have 3 carbon atoms, 6 hydrogen atoms and 1 oxygen atom. On the right - hand side, we have 1 carbon atom, 2 hydrogen atoms and $2 + 1=3$ oxygen atoms. This is not balanced.

Answer:

$2C_{3}H_{6}O
ightarrow6C + 6H_{2}+O_{2}$