8Zn + S8 ---> 8ZnS From the reaction above when 4 moles of zinc are reacted with 3 moles of S8, how many moles of the excess reactant remain?

2.5 mol

1.0 mol

4.5 mol

2.0 mol​

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?