Ce volum de oxigen se consuma in reactie cu fierul pentru a se obtine 300g magnetita?

What is a metal replacement reaction

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?

The number of moles of a given mass of a substance can be found without knowing its molecular formula or molar mass. true false