According to physics simulations, the atmosphere was composed of vaporised rock for several centuries after the impact until it cooled down below 1000 degrees. The entire surface was magma. https://en.wikipedia.org/wiki/Synestia
No; I don't remember the article saying specifically but I would assume if there is no solid land left, there is no liquid water left either. Water molecules would have been blasted into the "crust soup" and eventually re-condensed into gaseous water and eventually liquid water via atmospheric regeneration after the surface settled down a bit (because the chemicals that could be gaseous would have tended to float to the top of the soup as it settled down).
According to physics simulations, the atmosphere was composed of vaporised rock for several centuries after the impact until it cooled down below 1000 degrees. The entire surface was magma. https://en.wikipedia.org/wiki/Synestia
No; I don't remember the article saying specifically but I would assume if there is no solid land left, there is no liquid water left either. Water molecules would have been blasted into the "crust soup" and eventually re-condensed into gaseous water and eventually liquid water via atmospheric regeneration after the surface settled down a bit (because the chemicals that could be gaseous would have tended to float to the top of the soup as it settled down).