The illustration shows that air is a mixture composed of varying proportions of pure substances, as evidenced by the different percentages of gases like nitrogen (78%), oxygen (21%), argon (0.9%), carbon dioxide (0.04%), and water vapor (H2O), each existing as distinct chemical entities in the atmosphere.
Use the image to answer the question.
An illustration shows several molecules in a space. There are five different types. There is one molecule with one O and two Hs. This is labeled water (H2O) traces. Another molecule has two Os and is labeled oxygen (O2) 21%. Another molecule has one C and two Os. This is labeled carbon dioxide (CO2) 0.04%. Another molecule has two Ns and is labeled nitrogen (N2) 78%. Another molecule has one Ar and is labeled argon (Ar) 0.9%.
The image depicts the composition of air. Use the image to explain why this statement is correct: “Mixtures are composed of different proportions of pure substances.”
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