How much oxygen is needed for the complete combustion of 96 g of ethyl alcohol?
August 19, 2021 | education
| The reaction of burning ethyl alcohol is described by the following chemical reaction equation.
C2H5OH + 3O2 = 2CO2 + 3H2O;
When burning 1 mol of ethyl alcohol, 3 mol of oxygen is used.
Let’s calculate the chemical amount of a substance in 96 grams of ethyl alcohol.
M C2H5OH = 12 x 2 + 6 +16 = 46 grams / mol;
N C2H5OH = 96/46 = 2.087 mol;
This will involve 2.087 x 3 = 6.261 mol of oxygen.
Let’s calculate its volume.
Under normal conditions, one liter of ideal gas assumes a volume of 22.4 liters.
V O2 = 6.261 x 22.4 = 140.25 liters;
The volume fraction of oxygen in the air is 20.95%.
Taking this into account, the air volume will be:
V air = 140.25 / 0.2095 = 669.45 liters;
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