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The enthalpy of combustion of a substance -
- a)is always positive
- b)is always negative
- c)can be either zero or greater than zero
- d)is unpredictable till calculations are done.
Correct answer is option 'B'. Can you explain this answer?
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The enthalpy of combustion of a substance -a)is always positiveb)is al...
Why is standard enthalpy changes of combustion always negative? Because heat is always involved, the reaction is exothermic and therefore heat is lost to the surroundings. The energy required to break bonds is always less than the energy released when bonds are formed.
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The enthalpy of combustion of a substance -a)is always positiveb)is al...
The reason behind is that combustion reactions are always exothermic. So the enthalpy of combustion is always less than zero.
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The enthalpy of combustion of a substance -a)is always positiveb)is al...
Enthalpy of Combustion
The enthalpy of combustion is the heat released when one mole of a substance undergoes complete combustion with oxygen. It is a measure of the energy content of the substance.
Always Negative
The enthalpy of combustion is always negative. This is because combustion is an exothermic reaction, meaning it releases heat energy. When a substance combusts, it reacts with oxygen to form products with lower energy than the reactants, resulting in a net release of heat.
Exothermic Reaction
Combustion reactions are typically exothermic because they involve the breaking of bonds in the reactants and the formation of new bonds in the products. The overall process releases energy in the form of heat.
Calorimetry
The enthalpy of combustion can be experimentally determined using calorimetry, which involves measuring the heat released during the combustion of a known quantity of the substance.
Significance
Understanding the enthalpy of combustion of a substance is important for various applications, such as in the design of energy-efficient processes and the calculation of the energy content of fuels.
In conclusion, the enthalpy of combustion of a substance is always negative because combustion is an exothermic process that releases heat energy. This property makes it a valuable parameter for studying the energy content of substances.
The enthalpy of combustion is the heat released when one mole of a substance undergoes complete combustion with oxygen. It is a measure of the energy content of the substance.
Always Negative
The enthalpy of combustion is always negative. This is because combustion is an exothermic reaction, meaning it releases heat energy. When a substance combusts, it reacts with oxygen to form products with lower energy than the reactants, resulting in a net release of heat.
Exothermic Reaction
Combustion reactions are typically exothermic because they involve the breaking of bonds in the reactants and the formation of new bonds in the products. The overall process releases energy in the form of heat.
Calorimetry
The enthalpy of combustion can be experimentally determined using calorimetry, which involves measuring the heat released during the combustion of a known quantity of the substance.
Significance
Understanding the enthalpy of combustion of a substance is important for various applications, such as in the design of energy-efficient processes and the calculation of the energy content of fuels.
In conclusion, the enthalpy of combustion of a substance is always negative because combustion is an exothermic process that releases heat energy. This property makes it a valuable parameter for studying the energy content of substances.
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