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Ch.5 - Thermochemistry
Brown - Chemistry: The Central Science 14th Edition
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Capitolo 5, Problema 80d

Methanol (CH3OH) is used as a fuel in race cars. (d) Calculate the mass of CO2 produced per kJ of heat emitted.

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1
Write the balanced chemical equation for the combustion of methanol (CH3OH). The equation is CH3OH + 1.5 O2 → CO2 + 2 H2O.
Determine the molar mass of methanol (CH3OH) and carbon dioxide (CO2).
Calculate the amount of heat released per mole of methanol combusted. This information can be found in thermodynamic tables or can be calculated from enthalpy changes.
Using stoichiometry, calculate the mass of CO2 produced per mole of methanol combusted. This involves using the molar ratio from the balanced equation and the molar masses calculated in step 2.
Finally, calculate the mass of CO2 produced per kJ of heat emitted by dividing the mass of CO2 produced per mole of methanol by the heat released per mole of methanol, then multiplying by 1000 to convert from MJ to kJ.

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Combustion Reaction

A combustion reaction is a chemical process in which a substance (usually a hydrocarbon) reacts with oxygen to produce carbon dioxide and water, releasing energy in the form of heat. In the case of methanol (CH3OH), its combustion can be represented by the balanced equation: 2 CH3OH + 3 O2 → 2 CO2 + 4 H2O. Understanding this reaction is essential for calculating the amount of CO2 produced.
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Combustion Apparatus

Stoichiometry

Stoichiometry is the quantitative relationship between the reactants and products in a chemical reaction. It allows us to determine how much of each substance is consumed or produced based on the balanced chemical equation. In this context, stoichiometry will help calculate the mass of CO2 produced per kJ of heat emitted by using the molar ratios from the combustion of methanol.
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Stoichiometry Concept

Energy Release in Combustion

The energy released during combustion is typically measured in kilojoules (kJ) and is derived from the breaking and forming of chemical bonds. The heat of combustion for methanol can be found in thermodynamic tables, which provides the amount of energy released per mole of methanol burned. This value is crucial for determining the mass of CO2 produced per kJ of heat emitted, as it links the energy output to the amount of fuel consumed.
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Percorso guidato
02:24
Combustion Apparatus
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