When might a large volume of material have little mass

What is the overall order of reaction for rate = k[no]2[o2]

Mike and mitchell decide to have a foot race. they mark off a stretch of 100 yards, and recruit cindy to work the stopwatch. after running the race and looking at the results, cindy declared that mitchell was the fastest. so how did the boys times compare?

In what environment would mineral formation caused by high pressures and high temperatures most likely occur?