Fe2o3 is the major component in rust. how many atoms are in one molecule of rust?

What neutral atom is isoelectronic to mn+4

How many liters of hydrogen gas will be produced at stp from the reaction of 7.179×10^23 atoms of magnesium with 54.219g of phosphoric acid (h3po4) the equation is 3mg + 2h3(> mg(po4)2+3h2

If blood contains 150g of hemoglobin per liter of blood, how much hemoglobin would be contained in 10 ml of blood