13.) The hydrogenation of ethene gas under standard conditions (T = 298.15 K) shows a decrease in disorder (AS = -0.1207 kJ/(mol•K)) during an exothermic reaction (AH = -136.9
kJ/mol). Determine whether the reaction is spontaneous or nonspontaneous by calculating AG'.
C2H4 (g) + H2 (g) → C2H6 (g)

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 are forms of frozen water? check all that apply. dew frost hail rain sleet

Many ionic compounds and a few highly polar covalent compounds are because they completely ionize in water to create a solution filled with charged ions that can conduct an electric current.