Hey smarties...i need to know how to find the total atoms of elements in Ag(OH)3 if you could explain to me how to find it that would be great thanks you:)

The twister and runaway train are two coasters at the same amusement park. both coasters start at the same height. the coaster for the twister is twice the mass of the coaster for the runaway train. which roller coaster has greater gravitational potential energy at the start of the ride?