Which coefficient of O2 is needed to balance the equation C3H8 + O2 → 3CO2 + 4H2O?

5

Explanation:

Count the number of moles of O in the product side:

3x2 + 4

= 10

Divide it by 2 since O exists as diatomic molecule (O2)

10/2 = 5

Therefore, the coefficient required is 5.

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