How did dmitri mendeleev deal with elements that had not yet been discovered? he left blanks for them in his periodic table, as he predicted they would be discovered. he created them in his laboratory and placed them in his table. he ignored them, placing them in the table and shifting others when they were discovered. he gave them names and properties and placed them in the table.

Chlorine and water react to form hydrogen chloride and oxygen, like this: 2cl2 (g) + 2h2o (g) → 4hcl (g) + o2 (g) also, a chemist finds that at a certain temperature the equilibrium mixture of chlorine, water, hydrogen chloride, and oxygen has the following composition: compound concentration at equilibrium cl2 0.55m h2o 0.57m hcl 0.53m o2 0.34m calculate the value of the equilibrium constant kc for this reaction. round your answer to 2 significant digits.