a 50. l rigid container with a pressure of 2.24 atm initially has 0.58 moles of h2(g) and 0.42 moles of f2(g). the chemical reaction h2(g) f2(g) --> 2 hf(g) then went to completion to as great an extent as possible. what is the final pressure of the container, assuming temperature was the same before and after reaction and all gases acted ideally?