Calculate the number of molecules present in 3.50 mol feo2.
a. 2.11 x 1024 molecules
b. 2.107 x 1023 molecules
c. 3.50 x 1023 molecules
can anyone me with my chemistry final pl and only serious ppl

Measuring which physical property is most likely to produce the most precise results when trying to identify a substance

In which phase(s) do the molecules take the shape of the container?

Plz mark brainliest 30 points 1) find the momentum of a 12 kg snowball that is rolling with a velocity of 9 m/s. 2) an 8 ball with a mass of .5 kg is sitting at rest. it is hit by the cue ball (1 kg) traveling at 2.5 m/s. if the cue ball is at rest after the collision, how fast is the 8 ball traveling after the collision? 3) two football players are running toward each other. if the offensive player is 75 kg and is running 8 m/s, how fast must the 60 kg defensive player run in order for the two players to hit and stop?