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Sagot :
If a bottle of nail polish remover contains 179 ml of acetone, −4349.7kJ. heat would be released by its complete combustion.
Given Data:
The volume of acetone is 179 mL.
The density of acetone is 0.788 g/mL.
Below is a diagram illustrating how acetone burns.
CH3COCH3 + 4O2 = 3CO2 + 3H2O
The heat released during the given reaction is -1790 kJ/mol. The negative sign represents the release of energy.
The formula to calculate mass from density and volume is shown below.
Mass= Density × Volume
Substitute the values of density and volume of acetone in the above formula.
Mass=0.788g/mol× 179mL=141.052g
The formula to calculate number of moles is as follows.
Number of moles=Mass/ Molarmass
Acetone has a 58.08 g/mol molar mass.
Substitute the values of mass and molar mass of acetone in the above formula.
Number of moles= 141.052g/(58.08g/mol)=2.43mol
The heat that is released from combustion of one mole of acetone is -1790 kJ/mol.
So, the heat that would be released from combustion of 2.43 mole of acetone is
(−1790kJ/mol×2.43mol) that is -4349.7 kJ.
Therefore, the heat that is released by combustion of 179 mL of acetone is
−4349.7kJ.
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