The rate constant for a particular second-order reaction is 0.47 M-1 s-1 . If the initial concentration of reactant is
0.25 mol/L, it takes s for the concentration to decrease to 0.13 mol/L

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.