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Balance the following equation: C3H8 + O2 -> CO2 + H2O

Sagot :

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The chemical equation after it is balanced :

C₃H₈ + 5O₂ ⇒ 3CO₂ + 4H₂O

Further explanation  

The reaction equation is the chemical formula of reagents and product substances  

A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.  

Equalization of chemical reactions can be done using variables. Steps in equalizing the reaction equation:  

  • 1. gives a coefficient on substances involved in the equation of reaction such as a, b, or c, etc.  
  • 2. make an equation based on the similarity of the number of atoms where the number of atoms = coefficient × index between reactant and product  
  • 3. Select the coefficient of the substance with the most complex chemical formula equal to 1  

For gas combustion reaction which is a reaction of hydrocarbons with oxygen produces CO₂ and H₂O (water vapor). can use steps:  

Balancing C, H, and the last O atoms

Reaction :

C₃H₈ + O₂ ⇒ CO₂ + H₂O

1. Gives a coefficient

C₃H₈ + aO₂ ⇒ bCO₂ + cH₂O.

C ⇒ left = 3, right = b ⇒b = 3

H ⇒ left = 8, right = 2c ⇒2c=8 ⇒ c = 4

O ⇒ left = 2a, right = 2b+c ⇒ 2a=2b+c⇒2a=2.3+4⇒2a=10⇒a=5

The chemical equation becomes :

C₃H₈ + 5O₂ ⇒ 3CO₂ + 4H₂O

Learn more  

a chemical reaction / equation  

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balance chemical equations  

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