Dr. Nation has 0.75 mol of an unknown gas with a pressure of 500 mmHg and a volume of 290 ml. What is the temperature of this unknown gas? O 3.1k
O 9.3K
78 K
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Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

Plz mark brainliest 30 points1) 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?

What must occur for air masses to form fronts