How many atoms of aluminum (Al) are in 6.4 mol of aluminum

What effect might melting sea ice have for people who live in coastal areas?

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?

Find the mass, in grams, of 5.00*10^23 molecules of f2