You're asking about the reaction of bromine trifluoride (BrF₃) to form bromine (Br₂). However, you haven't provided a complete reaction equation or the other reactant involved.

To determine the moles of bromine formed, we need the balanced chemical equation for the reaction.

Here's a general approach to solving this type of problem:

1. Write the balanced chemical equation: This shows the stoichiometry of the reaction, indicating the mole ratios between reactants and products.

2. Identify the limiting reactant: The limiting reactant is the one that is completely consumed first, determining the maximum amount of product that can be formed.

3. Use the mole ratio from the balanced equation: The mole ratio tells us how many moles of bromine are produced for every mole of bromine trifluoride consumed.

4. Calculate the moles of bromine: Multiply the moles of the limiting reactant by the appropriate mole ratio.

Example:

Let's assume the reaction is:

2 BrF₃ + 3 H₂ → Br₂ + 6 HF

In this example, we have:

* 0.248 moles of BrF₃

* We need to know the moles of H₂ to determine the limiting reactant.

To proceed, you need to provide the following information:

* The complete balanced chemical equation: This will tell us the stoichiometry of the reaction.

* The amount of the other reactant: This is needed to determine the limiting reactant.

Once you provide this information, we can calculate the moles of bromine formed.