The equation that best represents the conservation of matter is one where the number of each type of atom is the same on both sides of the equation.
The first equation:
6H2O + 6CO2 → C6H12O6 + 6O2
This equation balances the number of each atom:
- On the left side, there are 12 H (from 6 H2O) and 6 C (from 6 CO2).
- On the right side, there are also 12 H (from C6H12O6) and 6 C (from C6H12O6).
- Additionally, the O atoms balance as well: 6 O (from 6 H2O) + 12 O (from 6 CO2) = 18 O on the left, and 6 O (from C6H12O6) + 6 O (from 6 O2) = 18 O on the right.
The other equations do not maintain this balance:
- The second equation (3H2O + 3CO2 → C6H12O6 + 6O2) does not work because the number of carbons is unbalanced.
- The third equation (6H2O + 6CO2 → C3H6O3 + 3O2) does not work as it has fewer carbons and oxygens on the right.
- The fourth equation (6H2O + 10CO2 → C6H12O6 + 4O2) does not balance the oxygens properly.
So, the correct response is:
6H2O + 6CO2 → C6H12O6 + 6O2