Question

How does the heat content of the reaction change in the process of photosynthesis when a glucose molecule is formed?

Answer 1

Both reactions release carbon dioxide and water. In cells, the chemical energy in food is converted to ATP and heat.

Answer 2

Answer:

The change in enthalpy is positive or heat of reaction is positive. It is released during the reaction.

Explanation:

In photosynthesis, the carbon dioxide molecules combine with water molecules to form glucose by the following reaction.

$6CO_{2}(g)+H_{2}O(l)-->C_{6}H_{12}O_{6}$

During this process of synthesis of glucose (a carbohydrate which gives energy to our body) heat is required. This energy is being provided by sunlight. Thus the reaction is endothermic.

According to sign conventions, the change in energy or heat of enthalpy of an endothermic reaction is positive, while change in enthalpy of an exothermic reaction is negative.

So here the heat content of the reaction change in photosynthesis is "positive".