A gas has a starting pressure of 8.90 atm and a final pressure of 1.35 atm. It's temperature is measured at 15.0 C. Can you determine it's initial temperature if its volume began at 3.35 L and ended at 7.20 atm?

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.