Answer :
When methanol (CH3OH) is combusted, it undergoes a chemical reaction with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). This combustion reaction is exothermic, meaning it releases energy in the form of heat. To determine the amount of energy released or absorbed, we need to calculate the heat of combustion, which is the amount of heat released per mole of the substance being combusted.
To calculate the energy released or absorbed, we can use the formula:
Energy released = Heat of combustion × Number of moles of CH3OH
1. Calculate the number of moles of CH3OH:
To do this, we need to use the molar mass of CH3OH, which is 32.04 g/mol.
Number of moles = Mass of CH3OH / Molar mass of CH3OH
Number of moles = 98.3 g / 32.04 g/mol
2. Calculate the heat of combustion of CH3OH:
The heat of combustion of CH3OH is -726 kJ/mol. This means that for every mole of methanol combusted, 726 kJ of energy is released.
3. Calculate the energy released or absorbed:
Energy released = -726 kJ/mol × Number of moles of CH3OH
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