Asample of iron has a mass of 46.8 grams and a volume of 6 cm3. what is the density of iron?

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.

An experimental procedure requires a 10 ml of acid to be dissolved

How many grams of co(g) are there in 74.5 ml of the gas at 0.933 atm and 30o c?