If a man ran 30m northerly and then 50m southerly in 1 minute. What is his distance? What is his displacement?
What is his speed?
What is his velocity?

nacl is added to the aqueous of what? ? in order to get a proper answer you have to specify the exact composition of the aqueous solution.

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.

c. 75.7

i think that is the right