Final answer:
The mass of fluorine in 1.25 moles of chlorine gas cannot be answered because fluorine and chlorine are different elements and the question appears to have a typo. For chlorine's atomic mass calculation, you'd combine the mass and abundance of isotopes 35Cl and 37Cl. The molar mass of chlorine (Cl2) must be used to determine the mass for chlorine moles.
Step-by-step explanation:
The mass of fluorine in 1.25 moles of chlorine gas cannot be determined with the information provided. The question appears to have a typo, as chlorine gas (Cl2) and fluorine (F2) are different elements. If you are asking about chlorine, it's important to know the correct molar mass of chlorine to find the mass. Chlorine has two naturally occurring isotopes: 35Cl and 37Cl. The atomic mass is calculated by accounting for the percentage abundance of each isotope and its respective atomic mass units (amu).
To get the average atomic mass of chlorine, you would use the formula: (Percentage of 35Cl/100) × Mass of 35Cl + (Percentage of 37Cl/100) × Mass of 37Cl. Using the details provided, a typical calculation would be: (0.7576 × 34.97 amu) + (0.2424 × 36.97 amu)
However, without the specific amounts or masses of 35Cl and 37Cl isotopes in your sample, we cannot provide the mass of chlorine in 1.25 moles of chlorine gas. If instead, you are looking for the mass of chlorine in moles of Cl2, you would use the molar mass of Cl2 (approximately 70.90 grams per mole) to calculate the mass.