Problem: Consider the following set of reactions:N2 + 2O2 → N2O4 ,ΔH=−8 kJ/molN2 + O2 → 2NO ,ΔH=180 kJ/molThe equations given in the problem introduction can be added together to give the following reaction:overall: N2O4 → 2NO + O2However, one of them must be reversed, reaction 1: N2 + 2O2 → N2O4What is the enthalpy for reaction 1 reversed?reaction 1 reversed: N2O4 → N2 + 2O2Express your answer numerically in kilojoules per mole.What is the enthalpy for reaction 2?

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FREE Expert Solution
FREE Expert Solution

We’re being asked to determine the enthalpy change (ΔHrxn) for the chemical reaction:


N2O→ 2 NO + O2


We can use Hess’s Law to determine the enthalpy change of the overall reaction from the given reactions:


1. N2 + 2 O2  →  N2O4      ΔH= −8 kJ/mol

2. N2 + O2  →  2 NO         ΔH= 180 kJ/mol


We now need to find a combination of reactions that when added up, gives us the overall reaction.


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Problem Details

Consider the following set of reactions:

N2 + 2O→ N2O4H=−8 kJ/mol

N2 + O→ 2NO ,ΔH=180 kJ/mol


The equations given in the problem introduction can be added together to give the following reaction:

overall: N2O→ 2NO + O2

However, one of them must be reversed, reaction 1: N2 + 2O→ N2O4

What is the enthalpy for reaction 1 reversed?

reaction 1 reversed: N2O→ N2 + 2O2

Express your answer numerically in kilojoules per mole.

What is the enthalpy for reaction 2?

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Hess's Law concept. You can view video lessons to learn Hess's Law. Or if you need more Hess's Law practice, you can also practice Hess's Law practice problems.

What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Wang's class at ALBANY.