Answer:
A. 3 x 10-12
Explanation:
Generally, the parts-per notation is used to represent very small concentration without any specific unit.
Parts per million is notated as ![10^{-6}](https://tex.z-dn.net/?f=10%5E%7B-6%7D)
Parts per billion is notated as ![10^{-9}](https://tex.z-dn.net/?f=10%5E%7B-9%7D)
Parts per trillion is notated as ![10^{-12}](https://tex.z-dn.net/?f=10%5E%7B-12%7D)
Hence, 3 parts per trillion will be written as 3 x ![10^{-12}](https://tex.z-dn.net/?f=10%5E%7B-12%7D)
The correct option is A.
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1 mole = 6.22 x 10^23 molecules (Avogadro's number)
15 moles x (6.22 x 10^23) = 9.33 x 10^24 atoms
Earth's greenhouse gases trap heat in the atmosphere and warm the planet.