What piece of laboratory equipment would you use to accurately measure the volume of a liquid

Harvey kept a balloon with a volume of 348 milliliters at 25.0˚c inside a freezer for a night.  when he took it out, its new volume was 322 milliliters, but its pressure was the same.  if the final temperature of the balloon is the same as the freezer’s, what is the temperature of the freezer? the temperature of the freezer is  kelvins.

How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5