What will the percent yield of a reaction be if the theoretical yield is 40.5 g Cu and experimentally a yield of 38.7 g Cu was measured?

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.

Which of the following would have less momentum than a 52 kg cheetah running at 10 m/s?

What human activity increases beach erosion?