Three identical flasks contain three different gases at standard temperature and pressure. Flask A contains CH4 flask B contains O3, and flask C contains N2.  Which flask contains the largest number of molecules?

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Matter and Measurement

In the universe, there is matter, energy, and void space. The universe contains energy and void space. The definition of matter can be considered as something which possesses mass and consumes space. Chemistry is that branch of science which deals with the study of matter. Under chemistry, nature, composition, and the changes occurring to matter are discussed.