Water boils at 100 degrees celcius under normal conditions. what would i have to do in order for water to boil at 90 degrees celcius instead?

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

Idon’t know how to solve this question

Joan writes four numbers on the board in standard form, and then she writes their scientific notation