What is the percent composition by mass for sodium (Na) in sodium phosphate (Na3PO4)? % Na = (_/_)x100% = _% NNA

please help.

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?

Light waves can move through , but they travel fastest when they move through a(n) .

Calculate the volume in ml of .500 g of ether