Calculate the moles of aluminum ions present in 250.0 g aluminum oxide.
Acetaminophen, a common aspirin substitute, has the formula C8H9NO2. determine the number of molecules acetaminophen in a 500-mg tablet.
Determine the number of oxygen atoms present in 25.0 g of carbon dioxide.
the density of lead (pb) is 11.3 g/cm3. calculate the volume of 1 mol of Pb.