I need help please it’s hard

What is the mass of sodium in 3 moles of sodium chloride

What are the first three quantum numbers for the electrons located in subshell 2s?

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?