The chemical formula for hematite is Fe o
Fe2O3

Asample of aluminum foil contains 8.60 × 1023 atoms. what is the mass of the foil?

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?

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?