What is the cellular process that releases the energy stored in food molecules

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 of each element in a 324.8 sample of co2

Which rate indicates the number of children that would be born per woman if she were to live to the end of her child bearing years