Here's how to calculate the number of millimoles of copper(II) fluoride (CuF2) in the flask:

1. Convert Liters to Milliliters:

* 1.15 L * 1000 mL/L = 1150 mL

2. Calculate Moles of CuF2:

* Moles = Molarity * Volume (in liters)

* Moles = 0.00335 M * 1.15 L = 0.00385 moles

3. Convert Moles to Millimoles:

* Millimoles = Moles * 1000

* Millimoles = 0.00385 moles * 1000 = 3.85 mmol

Therefore, the flask contains 3.85 millimoles of copper(II) fluoride.