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The density of the atmosphere (and hence, the relative number of molecules of gases available for chemical reactions) decreases as altitude increases because:

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aldana20

Answer:

Boyle’s Law, an inverse relationship exists between pressure and volume

Explanation:

We know that atmospheric preassure drops 1 mm Hg for every 10 m high.

And according to Boyle's Law, if preassure decreases volume will be increased.

Having in mind that density is the mass of anything ( air included) divided by the volume it occupies; if volume increases density will be lower.

So, lower pressure lower density .

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