Molecules of COâ‚‚, Hâ‚‚O, Câ‚‚Hâ‚…OH, and Oâ‚‚ will be present if the reaction goes to completion are
0 molecules Câ‚‚Hâ‚…OH
0 Oâ‚‚ molecules
2 and COâ‚‚ molecules
3 Hâ‚‚O molecules
Further explanation
The reaction equation is the chemical formula of reagents and product substances
the 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.
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
The reaction of the combustion of hydrocarbons with oxygen produces COâ‚‚ and Hâ‚‚O (water vapor). can use steps:
Balancing C atoms, H and last atoms O atoms
Equivalent reaction equation, if the number of atomic substances of the reactor is the same as the product substance
The reaction coefficient also shows the ratio of moles, volumes or molecules of substances involved in the reaction
Complete combustion of Hydrocarbons with Oxygen will be obtained by COâ‚‚ and Hâ‚‚O compounds.
If Oâ‚‚ is insufficient there will be incomplete combustion resulting in CO and Hâ‚‚O
In perfect combustion of ethanol (Câ‚‚Hâ‚…OH) and oxygen (Oâ‚‚), ethanol and oxygen will be converted entirely into COâ‚‚ and Hâ‚‚O at the end of the reaction
Ethanol and oxygen reactions:
Câ‚‚Hâ‚…OH + Oâ‚‚ ---> COâ‚‚ + Hâ‚‚O
We equalize first by giving coefficients a, b and c
Câ‚‚Hâ‚…OH + aOâ‚‚ ---> bCOâ‚‚ + cHâ‚‚O
C = left 2, right b -> b = 2
H = left 6, right 2c ---> c = 3
O = left 2a + 1, right 2b + c
2a + 1 = 2 (2) + 3
2a + 1 = 4 + 3
2a = 6
a = 3
So the equivalent reaction equation =
Câ‚‚Hâ‚…OH + 3Oâ‚‚ ---> 2COâ‚‚ + 3Hâ‚‚O
The comparison of the coefficients shows that: 1 Câ‚‚Hâ‚…OH molecule reacts with 3 molecule Oâ‚‚ produces 2 molecules of COâ‚‚ and 3 molecules of Hâ‚‚O
So the complete combustion of ethanol at the end of the reaction composition:
0 molecules Câ‚‚Hâ‚…OH
0 Oâ‚‚ molecules
2 and COâ‚‚ molecules
3 Hâ‚‚O molecules
Learn more
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Keywords : combustion, ethanol, molecules