For which substances would 2 cm^3 have a mass greater than 6g

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.

What is the mass defect of a mole of nuclei with 1.8 x 10^15 j/mol binding energy?

Identify the electromagnets with poles that are reversed from the electromagnet shown above