In winemaking, the sugars in grapes undergo fermentation by yeast to yield CH3CH2OH and CO2. During cellular respiration, sugar and enthanol are "burned" to water vapor andCO2.
Write a combustion reaction for ethanol.
I need help with balancing the equation
i think it's
C2H6OH(l) + 3O2(g) ---> 2CO2(g) + 3H2O(g)
am I correct?..thanks!•chemistry - paul, Sunday, October 25, 2015 at 3:06pm
looks good to me, except the C2H6OH should be C2H5OH.
comment:
I did that, but it said...try again!
then it said HINT:
Start by writing a balanced chemical equation for the fermentation reaction of C6H12O6 and for the respiration reaction (combustion) of C6H12O6...what formula should be used to find the standard enthalpy of a reaction? Use the standard enthalpy of formation values from your textbook when calculating the standard enthalpy of reaction for both fermentation and respiration. thanks!
To write a balanced combustion reaction for ethanol, here are the steps:
1. Write the unbalanced equation for the combustion of ethanol:
C2H5OH + O2 -> CO2 + H2O
2. Count the number of atoms for each element on both sides of the equation.
Left side: C - 2, H - 6, O - 1
Right side: C - 1, H - 2, O - 3
3. Balance the carbon (C) atoms by putting a coefficient of 2 in front of CO2.
C2H5OH + O2 -> 2CO2 + H2O
4. Balance the hydrogen (H) atoms by putting a coefficient of 3 in front of H2O.
C2H5OH + O2 -> 2CO2 + 3H2O
5. Finally, balance the oxygen (O) atoms by putting a coefficient of 3/2 in front of O2.
C2H5OH + 3/2 O2 -> 2CO2 + 3H2O
The balanced combustion reaction for ethanol is:
C2H5OH + 3/2 O2 -> 2CO2 + 3H2O
To balance the combustion reaction for ethanol (C2H5OH), you need to ensure that there is an equal number of each type of atom on both sides of the equation. Here is the balanced equation:
C2H5OH + 3O2 → 2CO2 + 3H2O
In this balanced equation, you have two carbon (C) atoms, six hydrogen (H) atoms, and two oxygen (O) atoms on both sides. This equation represents the complete combustion of ethanol, where it reacts with oxygen to produce carbon dioxide (CO2) and water (H2O).
When balancing equations, it is essential to consider the coefficients in front of each molecule or compound. These coefficients indicate the number of molecules or moles involved in the reaction. In this case, we need three molecules of oxygen (O2) to react with one molecule of ethanol (C2H5OH).
Regarding your question about finding the standard enthalpy of a reaction, you can use the formula ΔH = ΣΔHf(products) - ΣΔHf(reactants). ΔH represents the change in enthalpy of the reaction, ΣΔHf is the sum of the standard enthalpy of formation values for the products and reactants, respectively. The standard enthalpy of formation values can be found in your chemistry textbook or other reliable sources.
Hope this helps, and let me know if you have any further questions!