A1000 kg batch of a pharmaceutical powder containing 5 % by wt water is dried in a double cone drier. after drying 90 % of the water has been removed. sketch the process diagram and calculate the final batch composition and the weight of water removed.

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.

i do not get it   at all