If two atoms of sodium combine with one molecule of chlorine which of the best following could be a product

Calculate the expected ph values of the buffer systems from the experiments (a,b,c,d), using the henderson- hasselbalch equation, ph-pka+log[a-]/[ha]. use for pka values carbonic acid= 6.37, and acetic acid= 4.75.

The melting point of sulfur is 115 °c and its boiling point is 445 °c. what state would sulfur be in at 200 °c?

The empirical formula of a compound is ch2o and its mass is 120 amu/molecule, what is its formula?