Convert 150 grams of nitrogen to mols

Which is the layer underground where all empty spaces are filled with a combination of air and water ?

Clyde and marilyn are riding a roller coaster. during which section(s) of the track is their potential energy converted to kinetic energy? a. from point b to point c only b. from point b to point d only c. from point a to point b only d. from point a to point b and from point c to point d

Is 9 correct? and can someone me with 10? it’s due tomorrow, you