For the reaction provided, how many moles of Fe2O3 are produced when you start with 4.63 moles of Fe? 4 Fe + 3 O2 > 2 Fe2O3

Ahypothrticalax type of ceramic material is known to have a density of 2.10 g/cm3 and a unit cell of cubic symmetry with a cell edge length of 0.57 nm. the atomic weights of the a and x elements are 28.5and 30.0 g/mol, respectively. on the basis of this information, which of the following crystal structures is (are) possible for this material: sodium chloride, cesium chloride, or zinc blende

Which part of earth’s surface receives the most direct rays from the sun? a) equator b) ocean c) poles d) mountains

Chemistry worksheet - i am not sure what they are asking for exactly?