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Propane is 3 carbon chain, "di" oxide means two oxygen. Balance the equation by adding coefficients to make the the number of atoms the same on either side.

  Reactants  --->    Products
C3H8 + 5O2 ---> 3CO2 + 4H2O
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Answer:

For this question its the 3rd option

"The formulas of the reactants are C3H8 and O2. The formulas of the products are CO2 and H2O. "

Explanation:

This is followed by a second question:

What is the chemical equation for the burning of propane if all the products and reactants are in the gas phase?

The answer to this one is the 2nd option

"C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g) "

I hope this helps! Have a good day!

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