In 20 l of air, there is about 0.78 l of carbon dioxide. about how many liters of carbon dioxide are there in 1 l of air?

So for this we will be setting up a proportion. Since we know that for 20 L of air there is 0.78 L of CO₂, we can determine that for 1 L of air there is X L of CO₂ . We can set that up as such:

From here we can solve for x. Firstly, cross-multiply:

Next, divide both sides by 20:

For 1 L of air, there is 0.039 L of CO₂

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