In Dumas method for the estimation of $\mathrm{N}{2}$, the sample is heated with copper oxide and the gas evolved is passed over:

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Step 1: Understand the Dumas' Method Apparatus

In Dumas' method, the sequence of processes in the combustion tube is:
1. Organic compound is heated with excess  → produces , , and  (plus any  oxides if N is present)
2. The gas mixture exits the CuO section
3. The gases are passed over copper gauze (reduced copper)
4. Then passed through KOH solution (which absorbs  and )
5. Only  remains and is collected in the nitrometer

Step 2: Why Copper Gauze?

During heating with CuO, some nitrogen oxides

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