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Reverse the equation for the decomposition given since you are doing formation. This makes -5678 positive.

Lookup the enthalpy of formation of gaseous water and carbon dioxide and multiply them by their moles in the formation equation. Remember nitrogen is in base form, so it is 0. You want:

Delta H of Reaction = Sum of Prod - Sum of Reactants

5678 = X - [-2418 + 0 + -4722 ]

X = -1462

-1462/4 = -365.5

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Calculate standard enthalpy of formation of FeO?

You shouldn't "calculate" a standard enthalpy of formation. The beauty of standard enthalpies of formation is that they are already calculated for you. That is why they are delineated by the term "standard" - they are standards that were figured out by chemists some time ago, that never change, and can be found in tables usually in textbooks and even on Wikipedia. If you need to know the standard enthalpy of formation of FeO, Google it. And let me know what you find...because I can't seem to find a set answer either. I have found one site that lists the standard enthalpy of formation of FeO to be 271.9 kJ/mol. But it hasn't been so evident in other places. No wonder you were confused! Good luck.


What is the standard enthalpy of formation for N2 gas?

The standard enthalpy of formation for N2 gas is 0 kJ/mol.


What is the relationship between the standard enthalpy of formation and the standard enthalpy of reaction in chemical reactions?

The standard enthalpy of formation is the energy change when one mole of a compound is formed from its elements in their standard states. The standard enthalpy of reaction is the energy change for a reaction under standard conditions. The relationship between the two is that the standard enthalpy of reaction is the sum of the standard enthalpies of formation of the products minus the sum of the standard enthalpies of formation of the reactants.


How to calculate the enthalpy of a reaction?

To calculate the enthalpy of a reaction, you need to find the difference between the sum of the enthalpies of the products and the sum of the enthalpies of the reactants. This is known as the enthalpy change (H) of the reaction. The enthalpy change can be determined using Hess's Law or by using standard enthalpy of formation values.


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Related Questions

Calculate standard enthalpy of formation of FeO?

You shouldn't "calculate" a standard enthalpy of formation. The beauty of standard enthalpies of formation is that they are already calculated for you. That is why they are delineated by the term "standard" - they are standards that were figured out by chemists some time ago, that never change, and can be found in tables usually in textbooks and even on Wikipedia. If you need to know the standard enthalpy of formation of FeO, Google it. And let me know what you find...because I can't seem to find a set answer either. I have found one site that lists the standard enthalpy of formation of FeO to be 271.9 kJ/mol. But it hasn't been so evident in other places. No wonder you were confused! Good luck.


What is the standard enthalpy of formation for N2 gas?

The standard enthalpy of formation for N2 gas is 0 kJ/mol.


What is the relationship between the standard enthalpy of formation and the standard enthalpy of reaction in chemical reactions?

The standard enthalpy of formation is the energy change when one mole of a compound is formed from its elements in their standard states. The standard enthalpy of reaction is the energy change for a reaction under standard conditions. The relationship between the two is that the standard enthalpy of reaction is the sum of the standard enthalpies of formation of the products minus the sum of the standard enthalpies of formation of the reactants.


How to calculate the enthalpy of a reaction?

To calculate the enthalpy of a reaction, you need to find the difference between the sum of the enthalpies of the products and the sum of the enthalpies of the reactants. This is known as the enthalpy change (H) of the reaction. The enthalpy change can be determined using Hess's Law or by using standard enthalpy of formation values.


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The standard enthalpy for sodium sulphate is -1387kJ/mol.


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What is the purpose of defining the standard enthalpies of formation?

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What is the basic difference between enthalpy of formation?

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