# Enthalpy of Formation of Carbon Monoxide

• SherlockOhms
In summary, the task was to calculate the enthalpy for the formation of carbon monoxide using the given energy changes for the formation of carbon dioxide. The solution involved reversing the second equation and combining it with the first one to find the enthalpy of formation for CO. The next step was to substitute this value into the first equation and add the enthalpy of formation for CO2 to get the final enthalpy value.
SherlockOhms

## Homework Statement

Using the information provided for energy changes associated with the formation
of carbon dioxide, calculate the enthalpy for the formation of carbon monoxide.

C(gr) + O2(g) → CO2(g) ΔH (-393.5 kJ mol-1)
CO(g) + ½ O2 (g) → CO2 (g) ΔH (-283 kJ mol -1)
C(gr) + ½ O2 (g) → CO(g) ΔH = ?

None really.

## The Attempt at a Solution

Reverse equation #2 to get CO2 (g) → CO(g) + ½ O2 (g) (+283 kJ mol -1). I think that's one of the steps anyway. Haven't done of these in ages. Do I sub in for CO2 in equation #1 and then add the enthalpy of formations? What's the next step?

Combine first two equations in such a way they yield third.

Thanks for that.

## 1. What is the heat of formation?

The heat of formation, also known as the standard enthalpy of formation, is the amount of heat released or absorbed during the formation of a compound from its constituent elements in their standard states at a given temperature and pressure.

## 2. How is the heat of formation calculated?

The heat of formation is calculated by subtracting the sum of the standard enthalpies of formation of the reactants from the sum of the standard enthalpies of formation of the products. This is based on Hess's Law, which states that the total enthalpy change of a reaction is independent of the pathway between the initial and final states.

## 3. What is the significance of the heat of formation?

The heat of formation is an important thermodynamic property that helps determine the stability of a compound. A negative heat of formation indicates that the compound is more stable than its constituent elements, while a positive heat of formation indicates that the compound is less stable and tends to decompose into its constituent elements.

## 4. How does the heat of formation affect chemical reactions?

The heat of formation plays a crucial role in determining the direction and extent of a chemical reaction. Reactions with a negative heat of formation are exothermic and tend to proceed spontaneously, while reactions with a positive heat of formation are endothermic and require an input of energy to proceed.

## 5. Can the heat of formation be measured experimentally?

Yes, the heat of formation can be measured experimentally using calorimetry. This involves measuring the heat released or absorbed by a reaction under controlled conditions and using this information to calculate the heat of formation. However, the experimental values may differ slightly from the theoretical values due to factors such as experimental error and non-ideal conditions.

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