What is the gram molecular mass of `O_2` and `O_3`?  

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Gram molecular mass of a substance is the amount (in grams) that will make up one mole of that substance. This is also equal to the mass of each individual atom in molecule. 

To determine the gram molecular mass of a given molecule, we will have to determine the mass of all the atoms in that molecule. Oxygen (`O_2` ) has two atoms of oxygen, each of which has an atomic mass of 16 g/mole. Hence the total molecular mass of oxygen gas is 32 g/mole (= 2 x 16 g/mole). 

Similarly, 3 atoms of oxygen make up ozone (`O_3`) and each of these atoms has an atomic mass of 16 g/mole. Thus, the molecular mass of ozone molecule is 48 g/mole (= 3 x 16 g/mole). 

Thus, the gram molecular mass of oxygen gas and ozone is 32 g and 48 g, respectively.

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