Answer
$$250 \ mL.$$
Work Step by Step
Since $1 \ L= 1000 \ cm^3$ and $1\ mL= 10^{-3} \ L$, then $1 \ mL =1 \ cm^3$ and hence
$$250 \ cm^3 =250 \ mL.$$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.