PLEASE HELP When determining the mass of product used or reactant consumed, the number of moles must be determined before comparing two substances because
When determining the mass of product used or reactant consumed, the number of moles must be determined before comparing two substances because

A) atoms have the same mass but moles are different for each substance.

B) masses are the same for different substances.

C) different substances have different masses due to their atomic make-up.

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?

Skills of homo sapiens were found an excavation. the skulls were preserved because the bodies were frozen. so, these fossils are (blank) fossils.the image shows the evolution of skulls beginning 2 to 3 million years ago. based on the image, modern human skulls(blank) ape skulls.

What is the percent by mass of oxygen in fe2o3