How many molecules are in 23.1 g of Fe2O3?

How will the emission of an alpha particle affect the atomic number of an atom

Scientific evidence tells us that the cause of earths four season is the tilt of earth as it revolves around the sun. the student is instructed to illustrate this information in a science notebook. how will the student illiterate winter in the northern hemisphere?

Based on its chemical properties, identify the position of each chemical family on the periodic table.