19. which of the following chemical equations represents
propane combusts?
a. 2 cshe (g) + 5o2 (g) → 3c02(g) + 4h20 (1)
b. 2 cshe (g) + 5o2 (g) → 3co2(g) + 3h20(1
c. cshe (g) + o2 (g) → co2(g) + h2o(1)
d. csha (g) + 5o2 (g) → 3co2(g) + 4h2o(1)

(option D. with the proviso that the subscripts of propane's chemical formula must be corrected)

Explanation:

Propane is the saturated hydrocarbon, alkane, with chemical formula C₃H₈ or CH₃CH₂CH₃.

The complete combustion of the hydrocarbons yield carbon dioxide (CO₂) and water (H₂O).

The chemical equation that represents this combustion is:

Once you balance it, you get:

        Left side           Right side

C         3                          3

H         8                          4×2 = 8

O        5×2 = 10               3×2 + 4 = 10

That equation corresponds to the option D. of the list, with the proviso that the subscripts of propane's chemical formula must be corrected

i'm pretty sure its b i might be wrong though!