In these experiment the only source of calcium ion is calcium hydroxide. Using your Ksp values calculate the solubility of calcium hydroxide (in moles/L) in 0.3M NaOH. Hint: the amount of hydroxide from the NaOH>>>Ca(OH)2 Ksp of Calcium Hydroxide was .01458

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)