Question: how many moles of fluorine gas are present?
Answer: The molar mass (M) of fluorine is 19.0 g/mol. Therefore, the number of moles (n) for fluorine is: [n = 200 grams ÷ 19.0 g/mol] = 10.5 moles. There are 10.5 moles in 200 grams of fluorine.