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In answering the above questions, which law has been used? \( [\mathrm{C}=12, \mathrm{N}=14 \) \( 0=16] \)

1. Avogadro's law
2. Mass balance
3. Equilibrium
4. All of the above

Correct answer: Mass balance

Solution

The calculation relies on balancing the total mass of each element before and after the reaction, which is the mass balance principle. Avogadro’s law and equilibrium are not the governing ideas here.

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