Question

Which of these is a balanced chemical equation?

CO(g)+O2(g) --> CO2(g)
CO(g)+2O2(g) -->2CO2(g)
2CO(g)+O2(g) --> 2CO2(g)
2CO(g)+2O2(g) ---> 2CO2(g)

Answer 1

The balanced chemical equation from the given options is 2CO(g)+O2(g) --> 2CO2(g), where the atoms of each element are balanced on both the reactant and product sides.

Step-by-step explanation:

Among the given options, the balanced chemical equation is the one where the number of atoms of each element in the reactants matches the number of atoms of that element in the products. To determine this, we must check each equation:

1. CO(g)+O2(g) --> CO2(g) is not balanced; carbon is balanced, but oxygen is not.
2. CO(g)+2O2(g) -->2CO2(g) is not balanced; there are more oxygen atoms on the reactant side.
3. 2CO(g)+O2(g) --> 2CO2(g) is balanced; there are 2 carbon atoms and 2x2=4 oxygen atoms on both sides.
4. 2CO(g)+2O2(g) ---> 2CO2(g) is not balanced; there are 2 carbon atoms and 4 oxygen atoms on the reactant side, but only 2 oxygen atoms on the product side.

Therefore, the balanced chemical equation is 2CO(g)+O2(g) --> 2CO2(g).

Answer 2

So the original equation would look like: CO(g)+O2(g) --> CO2(g)

We can count the number of elements on each side of the equation to determine if it is balanced.

For A CO(g)+O2(g) --> CO2(g) there are 3O in the product side an 2O in the reactant side, so it is not balanced

For B CO(g)+2O2(g) -->2CO2(g) there are 2C on the product side, but only 1 C on the reactant side so it is not balanced.

For C 2CO(g)+O2(g) --> 2CO2(g) there are 2C on the product side and 2C on the product side, so far it is correct, we'll them check the O.
There are 4O on the reactant side and 4O on the product side. So it is correctly balanced.

Meaning your answer is
C.) 2CO(g)+O2(g) --> 2CO2(g)