2C2H5OH + O2 → 2CH3CHO + 2H2O
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Word Equation
Ethanol + Dioxygen = Acetaldehyde + Water
Two moles of
and one mole of
react to lớn form two moles of
and two moles of
Reaction Expressions
Kc or Q = ( [CH3CHO]2 [H2O]2 ) / ( [C2H5OH]2 [O2] )
(assuming all reactants and products are aqueous. substitutue 1 for any solids/liquids, and Psubstance for gases.)
rate = -1/2 * (Δ[C2H5OH] / Δt) = -(Δ[O2] / Δt) = 50% * (Δ[CH3CHO] / Δt) = 50% * (Δ[H2O] / Δt)
(assuming constant volume in a closed system and no accumulation of intermediates or side products)
Instructions
To balance a chemical equation, enter an equation of a chemical reaction and press the Balance button. The balanced equation will appear above.
- Use uppercase for the first character in the element and lowercase for the second character. Examples: Fe, Au, Co, Br, C, O, N, F.
- Ionic charges are not yet supported and will be ignored.
- Replace immutable groups in compounds to lớn avoid ambiguity. For example, C6H5C2H5 + O2 = C6H5OH + CO2 + H2O will not be balanced, but XC2H5 + O2 = XOH + CO2 + H2O will.
- Compound states [like (s) (aq) or (g)] are not required.
- You can use parenthesis () or brackets [].
How To Balance Equations
Read our article on how to lớn balance chemical equations or ask for help in our chat.
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Balance C2H5OH + O2 = CH3CHO + H2O Using the Algebraic Method
To balance the equation C2H5OH + O2 = CH3CHO + H2O using the algebraic method step-by-step, you must have experience solving systems of linear equations. The most common methods are substitution/elimination and linear algebra, but any similar method will work.
Label Each Compound With a Variable
Label each compound (reactant or product) in the equation with a variable to lớn represent the unknown coefficients.
a C2H5OH + b O2 = c CH3CHO + d H2O
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Create a System of Equations
Create an equation for each element (C, H, O) where each term represents the number of atoms of the element in each reactant or product.
C: 2a + 0b = 2c + 0d H: 6a + 0b = 4c + 2d O: 1a + 2b = 1c + 1d
Solve For All Variables
Use substitution, Gaussian elimination, or a calculator to lớn solve for each variable.
- 2a - 2c = 0
- 6a - 4c - 2d = 0
- 1a + 2b - 1c - 1d = 0
Use your graphing calculator's rref() function (or an online rref calculator) to lớn convert the following matrix into reduced row-echelon-form:
[ 2 0 -2 0 0] [ 6 0 -4 -2 0] [ 1 2 -1 -1 0]
The resulting matrix can be used to lớn determine the coefficients. In the case of a single solution, the last column of the matrix will contain the coefficients.
Simplify the result to lớn get the lowest, whole integer values.
- a = 2 (C2H5OH)
- b = 1 (O2)
- c = 2 (CH3CHO)
- d = 2 (H2O)
Substitute Coefficients and Verify Result
Count the number of atoms of each element on each side of the equation and verify that all elements and electrons (if there are charges/ions) are balanced.
2 C2H5OH + O2 = 2 CH3CHO + 2 H2O
Reactants Products C 4 4 ✔️ H 12 12 ✔️ O 4 4 ✔️ Since there is an equal number of each element in the reactants and products of 2C2H5OH + O2 = 2CH3CHO + 2H2O, the equation is balanced.
Balance C2H5OH + O2 = CH3CHO + H2O Using Inspection
The law of conservation of mass states that matter cannot be created or destroyed, which means there must be the same number atoms at the kết thúc of a chemical reaction as at the beginning. To be balanced, every element in C2H5OH + O2 = CH3CHO + H2O must have the same number of atoms on each side of the equation. When using the inspection method (also known as the trial-and-error method), this principle is used to lớn balance one element at a time until both sides are equal and the chemical equation is balanced.
1. Count the number of each element on the left and right hand sides
| Reactants (Left Hand Side) | Products (Right Hand Side) | ||||||
|---|---|---|---|---|---|---|---|
| Reactants | Products | ||||||
| C2H5OH | O2 | Total | CH3CHO | H2O | Total | ||
| C | 2 | 2 | 2 | 2 | ✔️ | ||
| H | 6 | 6 | 4 | 2 | 6 | ✔️ | |
| O | 1 | 2 | 3 | 1 | 1 | 2 | ❌ |
2. Multiply coefficients for compounds to lớn balance out each element
For each element that is not equal, try to lớn balance it by adding more of it to lớn the side with less. Sometimes there may be multiple compounds with that element on one side, so sánh you'll need to lớn use your best judgement and be prepared to lớn go back and try the other options.
O is not balanced. Add 1 molecule of CH3CHO to lớn the product (right-hand) side to lớn balance Oxygen:
C2H5OH + O2 = 2CH3CHO + H2OReactants Products C 2 4 ❌ H 6 10 ❌ O 3 3 ✔️ C is not balanced. Add 1 molecule of C2H5OH to lớn the reactant (left-hand) side to lớn balance Carbon:
2C2H5OH + O2 = 2CH3CHO + H2OReactants Products C 4 4 ✔️ H 12 10 ❌ O 4 3 ❌ H is not balanced. Add 1 molecule of H2O to lớn the product (right-hand) side to lớn balance Hydrogen:
2C2H5OH + O2 = 2CH3CHO + 2H2OReactants Products C 4 4 ✔️ H 12 12 ✔️ O 4 4 ✔️
3. Verify that the equation is balanced
Since there are an equal number of atoms of each element on both sides, the equation is balanced.
2C2H5OH + O2 = 2CH3CHO + 2H2O
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