Under identical conditions, separate samples of o2 and an unknown gas were allowed to effuse through identical membranes simultaneously. after a certain amount of time, it was found that ml of o2 had passed through the membrane, but only ml of of the unknown gas had passed through. what is the molar mass of the unknown gas?

Consider the nuclear equation below. 239/94 pu—-> x+ 4/2 he. what is x?

An electron moved from shell n = 2 to shell n = 1. what most likely happened during the transition? a fraction of a photon was added. a photon of energy was absorbed. a fraction of a photon was removed. a photon of energy was released.

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?