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There are millions of different kinds of molecules, more organic ones than inorganic because they are tailored to a biological role.

An estimate of the total number of molecules making up the earth is difficult to estimate, and changes slightly all the time. The number of atoms, however, can be extrapolated from the mass and composition of the Earth. It is about 1.33 x 1050 atoms. The number of molecules should then be within the next two lower orders of magnitude, or at least 1 x 1048.

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Q: How many molecules are there in the world?
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