Question

multiple choice
12 h₂o + light energy → c₆h₁₂o₆ + 6 o₂ + 6 co₂ + 6 h₂o
6 co₂ + 12 h₂o + light energy → c₆h₁₂o₆ + 6 o₂
c₆h₁₂o₆ + 6 o₂ + 12 h₂o + light energy → 6 co₂ + 12 h₂o
6 co₂ + light energy → c₆h₁₂o₆ + 6 o₂ + 6 h₂o
6 co₂ + 12 h₂o + light energy → c₆h₁₂o₆ + 6 o₂ + 6 h₂o

Explanation:

Step1: Recall photosynthesis equation

The general equation for photosynthesis is the combination of carbon - dioxide and water in the presence of light energy to produce glucose and oxygen.

Step2: Check atom conservation

In photosynthesis, 6 molecules of carbon - dioxide ($CO_2$) and 12 molecules of water ($H_2O$) react with light energy to form 1 molecule of glucose ($C_6H_{12}O_6$) and 6 molecules of oxygen ($O_2$). The correct balanced equation is $6CO_2 + 12H_2O+\text{Light energy}
ightarrow C_6H_{12}O_6 + 6O_2$.

Answer:

$6CO_2 + 12H_2O+\text{Light energy}
ightarrow C_6H_{12}O_6 + 6O_2$ (the second option in the multiple - choice list)