Final answer:
Option B, 2N2O → 2N2 + O2, correctly represents the balanced equation for the decomposition of dinitrogen oxide gas into its elements, ensuring the number of nitrogen and oxygen atoms are equal on both sides.
Step-by-step explanation:
The question involves writing the balanced chemical equation for the decomposition of dinitrogen oxide gas (N2O) into its elements. The correct equation is option B:
2N2O → 2N2 + O2
In this decomposition reaction, two molecules of dinitrogen oxide decompose to form two molecules of nitrogen gas (N2) and one molecule of oxygen gas (O2). By balancing the equation as shown, we ensure that the number of nitrogen and oxygen atoms are equal on both sides of the equation, satisfying the law of conservation of mass.