The sum of the products' enthalpies in this reaction is less than the sum of the reactants' enthalpies.The sum of the products' enthalpies in this reaction is less than the sum of the reactants'...

The sum of the products' enthalpies in this reaction is less than the sum of the reactants' enthalpies.

The sum of the products' enthalpies in this reaction is less than the sum of the reactants' enthalpies.

C6H12O6 + 6O2 → 6CO2 + 6H2O

3000 kg      150kg   150kg    200 kg

A. Explain how this change in energy could happen in a chemical reaction.

B. What kind of reaction, energetically, is this?

C. If this was a reversible reaction AND energy was added to this system, which direction will the equilibrium shift?

D. Is it likely that this reaction would be reversible?
Explain your answer in terms of changes in

  1. enthalpy,
  2. entropy, and
  3. Gibbs Free energy.

Asked on by tdj4325

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jihyunkim67's profile pic

jihyunkim67 | High School Teacher | (Level 1) Assistant Educator

Posted on

This is a simple chemistry question that can be answered when you study enthalpy. This equation represents respiration, as glucose and oxygen together are converted into carbon dioxide, water and energy. This shows how our body utilizes glucose to produce energy that we need to function in our daily lives.

As you see here, the sum of products' enthalpies is smaller than the reactants'. This is because heat was released when products were formed. The loss of enthalpies resulted from the release of heat.

This is an exothermic reaction since the loss of enthalpies signify heat release during the course of reaction. This is one of the most important characteristics of respiration as our body requires energy from glucose to function.

The equilibrium shifts to the opposite side of the energy added, therefore if energy was added to the reactants side, then the equilibrium will shift to the right.

This reaction is reversible, as we see in the functioning of plants. When you reverse the process of respiration and add energy to the reactants side, you will get the equation for photosynthesis, which is carbon dioxide and water turned into glucose and oxygen.

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