Oxygen gas (O2) is made up of 2 atoms of oxygen. Since oxygen has an atomic mass of 16 g/mole, the molar mass of oxygen gas (O2) is 2 x 16 g/mole = 32 g/mole.
Since 1 mole of oxygen is equivalent to 32 g,
4 moles of oxygen gas would be equivalent to 4 moles x 32 g/mole = 128 g.
Thus, 4 moles of oxygen gas (O2) would have a mass of 128 g.
In general, when we have to find the amount, in grams, of a substance, given its amount in moles, we first have to figure out its molar mass. The molar mass is equal to the atomic mass of all the atoms that constitute that substance. Then we can multiply the molar mass with the number of moles to get the amount of substance in grams.
Hope this helps.
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