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Grouping them all together allows ease of notation and reflects the change that can occur. Because the amounts produced in a given reaction vary widely depending on the circumstances, the proportion of each oxide to the others can be quite different. For example, it may be 1NO: 2NO2 in one situation, but 3NO: 2NO2 in a different one, and may not even involve one at all (e.g. all NO and no NO2).

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14y ago
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6mo ago

The general expression NOx is used because it represents the collective group of nitrogen oxides, which includes various compounds such as nitric oxide (NO), nitrogen dioxide (NO2), and others. This allows for a more comprehensive understanding and discussion of the overall effects and sources of nitrogen oxide pollution. Moreover, the relative proportions of NO and NO2 in the atmosphere can vary depending on environmental conditions, making a general expression more appropriate.

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Q: Why is the general expression NOx used rather than a specific molecular formula?
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