How much energy is absorbed by 300 g of methanol as it evaporates?

How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer

At 300 mm hg, a gas has a volume of 380 l, what is the volume at standard pressure

A4.86 g piece of metal was placed in a graduated cylinder containing 15.5 ml of water. the water level rose to 17.3 ml. what is the density of the metal. i need the steps of how to solve it to so i can use a formula to work out other problems.