There’s also a back part to the first on i posted

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

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.

Imagine that you push on a large rock. at what point does your effort change the rock’s mechanical energy?