Now consider the following set of reactions: N2 + 2O2?N2O4 ,? H =?8 kJ/mol N2 +

Question

Now consider the following set of reactions:

N2 + 2O2?N2O4 ,?H=?8 kJ/mol

N2 + O2?2NO ,?H=180 kJ/mol

Part A

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

overall: N2O4?2NO + O2

However, one of them must be reversed. Which one?

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

overall:

However, one of them must be reversed. Which one?

Correct

Part B

What is the enthalpy for reaction 1 reversed?

reaction 1 reversed: N2O4?N2 + 2O2

Express your answer numerically in kilojoules per mole.

Explanation / Answer

N2 + 2O2?N2O4 ,?H=?8 kJ/mol

Energy is released, hence exothermic reaction

so when we reverse the reaction, the above exothermic reaction becomes Endothermic reaction [enegry is gained]

so for reaction 1 reversed, delta H = +8 KJ/mole

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