Question

When the following equation is balanced with the lowest whole number coefficients possible, what is the coefficient in front of O2? (2 points) C3H8 (g) + O2 (g) yields CO2 (g) + H2O (g)

Answer 1

5 because the reaction yields 10 oxygen atoms

Answer 2

Answer:

5 is the coefficient in front of O2

Explanation:

You need to balance the chemical equation:

C3H8     +       O2    →     CO2        +         H2O

To balance the equation, you can see the amount of carbons: 3, so you need to put in the other side of equation the number 3 in fron of the CO2.

Then the number of Hidrogen must be the same in both side of ecuation: 8, you need put an 4 in front of the H20, because you multiply 4 to 2.

Now you addit the number of oxigen in the right side of ecuation and divide to 2 (because you have O2) and put this result (in this case 5) in front of O2.

C3H8     +      5 O2    →    3 CO2        +       4  H2O