calculating - a sample of barium nitrate is placed into a jar containing water. the mass of the barium nitrate sample is 27g. assume the water is at 20°c and that the resulting barium nitrate solution is saturated. what mass of water is present in the jar?

show your work.

Astable electron arrangement for an atom is one that does not easily change. how is this arrangement arrived at? a. valence electrons are transferred or shared to create a full outer shell of electrons. b. valence electrons are discarded into space to create a full outer shell of electrons. c. protons (positive charge) pair with valence electrons (negative charge) to create a strong bond. d. outer shells with valence electrons are transferred or shared.