How many grams of O2 are in 2.5 moles of O2?
The molar mass of O2 (oxygen gas) is 32 g/mol. To find the mass of 2.5 moles of O2, you would multiply the number of moles by the molar mass.
Mass of 2.5 moles of O2 = 2.5 moles * 32 g/mol = 80 grams
Therefore, there are 80 grams of O2 in 2.5 moles of O2.