Problem: A gas-phase reaction was run in an apparatus designed to maintain a constant pressure.Write a balanced chemical equation for the reaction depicted.

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We are asked to write a balanced chemical equation for the reaction depicted.


red → O

blue → N


red pair→ O2

blue pair→ N2

red-blue pair → NO


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Problem Details

A gas-phase reaction was run in an apparatus designed to maintain a constant pressure.

A piston applies pressure to a cylinder containing two O2 molecules and two N2 molecules.  This leads to four NO molecules.

Write a balanced chemical equation for the reaction depicted.

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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 Enthalpy of Formation concept. You can view video lessons to learn Enthalpy of Formation. Or if you need more Enthalpy of Formation practice, you can also practice Enthalpy of Formation practice problems.