how did the flaming splint behave when it was inserted into the tube with CO2? in what ways was this different from the reaction of the H2(g) to the flaming splint?

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.