Final answer:
The 125 mL flask has 0 decimal places.
Step-by-step explanation:
The question asks how many decimal places there are in a 125 mL flask. A decimal place refers to the position of a digit after the decimal point in a number. In the case of a 125 mL flask, there are no decimal places because the volume is given as a whole number. So, the answer is 0 decimal places.