How many molecules are in 0.500 mole of N2O5?

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 subscript for oxygen in its molecular formula

Exit what is the density of an object having a mass of 5.0 g and a volume of 45.0 cm3?