Calculate number of moles in 4g of methane gas

What is the mass of 8 moles of sodium atoms

At 450 mm hg a gas has a volume of 760 l, what is its volume at standard pressure

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?