How many moles are represented by 86.5 g of Ca(OH)2?
*please help fast*

Order the following from smallest to largest atom, electron, quark, proton, neutron, molecule, nucleus

10-14. (a) when 100.0 ml of weak acid ha were titrated with 0.093 81 m naoh, 27.63 ml were required to reach the equivalence point. find the molarity of ha. (b) what is the formal concentration of a- at the equivalence point? (c) the ph at the equivalence point was 10.99. find pk. for ha. (d) what was the ph when only 19.47 ml of naoh had been added?

Compare the valence electron configuration of the nobles gas elements seen here. what statement is correct?