Question: 1 mol of o2 is how many grams?
Answer: The answer is 0.031251171918947. We assume you are converting between moles O2 and gram. You can view more details on each measurement unit: molecular weight of O2 or grams The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles O2, or 31.9988 grams.