What is the molar mass of an unknown gas with a density of 8.25 g/L when the temperature is -30°C and the pressure is 954 mmHg?

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?

Which of these expressions are correct variations of the combined gas law? p1v1t2 = p2v2t1 both

To find the enthalpy of a reaction in the lab, you measured the of the reactants and the change during the reaction.