Please help quickly as possible thank you :) ​

If a polyatomic ionic compound has gained two hydrogen ions, then how does its name begin?

In vapor-liquid equilibrium in a binary mixture, both components are generally present in both phases. how many degrees of freedom are there for such a system? the reaction between nitrogen and hydrogen to form ammonia occurs in the gas phase. how many degrees of freedom are there for this system? steam and coal react at high temperatures to form hydrogen, carbon monoxide, carbon dioxide, and methane. the following reactions have been suggested as being involved in the chemical transformation:

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