# Why is This Reaction Endothermic?

• Nanu Nana
In summary, the conversation discusses the direction and nature of a reaction involving carbon monoxide and hydrogen gas at different temperatures. The question is whether the reaction is exothermic or endothermic when the temperature is increased from 1000°C to 1500 °C. Through a discussion of Le Chatelier's principle, it is determined that the reaction is endothermic as the system tries to counter the increase in temperature by producing more CO.
Nanu Nana

## Homework Statement

At 1500 ° C , CO is formed more than at 1000 ° C. Is the reaction from left to right exothermic or endothermic?

## Homework Equations

C(s) + H2O ↔CO(g) + H2[/B]

## The Attempt at a Solution

I think its Exothermic reaction . The temperature is increased from 1000°C to 1500 °C . If heat increases the CO + H2 (products) shall produced more. Heat is a product in a exothermic reaction .So
C(s) + H2 ↔CO(g) + H2 +x KJ
But correct answer seems to be endothermic. I don't know why?
[/B]

If the system is initially at equilibrium then you add more water vapor, in which direction do you expect the reaction to go? Similarly, if the system is initially at equilibrium then you add more hydrogen gas, in which direction do you expect the reaction to go?

If you add hydrogen , the reaction shifts to the right

If the products increase when the temperature is increased, then the reaction has to be endothermic. The energy could then be looked at as a reactant and when you increase the reactants, the system has to shift to making more product to compensate- therefore the system would create more CO at higher temperatures.

In an equilibrium reaction the system always tries to counter the change introduced. In this reaction the temperature increases so the system tries to decrease the temperature by increasing the production of CO. So the forward reaction decreases the surrounding temperature meaning it is an endothermic reaction.

## 1. Why is this reaction endothermic?

This reaction is endothermic because it absorbs heat from its surroundings, resulting in an increase in the system's internal energy.

## 2. What factors determine if a reaction is endothermic?

The factors that determine if a reaction is endothermic include the change in enthalpy (ΔH) of the reaction, the activation energy required for the reaction to occur, and the strength of the bonds in the reactants and products.

## 3. How does an endothermic reaction differ from an exothermic reaction?

An endothermic reaction absorbs heat from its surroundings, while an exothermic reaction releases heat to its surroundings.

## 4. Can an endothermic reaction occur spontaneously?

No, an endothermic reaction cannot occur spontaneously without an external source of energy, such as heat, to drive the reaction forward.

## 5. How can we measure the endothermicity of a reaction?

The endothermicity of a reaction can be measured by conducting the reaction in a calorimeter and measuring the change in temperature of the system. A positive change in temperature indicates an endothermic reaction.

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