The two flasks above are connected with stopcock. The flask of H2 has an initial pressure of 1.25 atm, and the initial pressure of the N2 is 0.75 atm. When the stopcock is opened and the gases mix, what is the pressure of the mixture?

nuhygjhuhuouh9oygyuhuh8h9guig97uogh8uog978o0rfyhkmkv h

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.