Find the average atomic mass for boron if 20% of boron atoms have a mass of 10.0129371 amu and 80% of boron atoms have a mass of 11.0093055 amu. Round answer to 2 decimal places.

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.

If two objects at different te,peraure are in contact with each other what happens to their temperature

Chlorophyll a had the molecular formula c55h72mgn4o5 how many atoms are in this molecule