Problem: Calculate ΔHrxn for the following reaction2 NOCl (g) → N2 (g) + 02 (g) + Cl2 (g)Given the following set of reactions;1/2 N2 (g) + 1/2 02 (g) → NO (g)          ΔH= 90.3KJNO (g) + 1/2 Cl2 (g) → NOCl (g)          ΔH = - 38.6 KJ

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FREE Expert Solution

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


2 NOCl (g) → N(g) + O(g) + Cl(g)


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


1. 1/2 N(g) + 1/2 O(g) → NO (g)          ΔH = 90.3KJ
2. NO (g) + 1/2 Cl(g) → NOCl (g)           ΔH = - 38.6 KJ


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


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Problem Details

Calculate ΔHrxn for the following reaction

2 NOCl (g) → N(g) + 0(g) + Cl(g)

Given the following set of reactions;

1/2 N(g) + 1/2 0(g) → NO (g)          ΔH= 90.3KJ
NO (g) + 1/2 Cl(g) → NOCl (g)          ΔH = - 38.6 KJ

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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 Waddell's class at UC.