A reaction takes place when 1.6 mol is added to 2.7 mol 02 what is present at the end of the reaction?

Oxygen= 88ghydrogen= 12g

The internal energy of the system we can term it as total potential energy and kinetic energy. energy flows out of the surrounding from the system then we can say that the internal energy of the final state is lower than its initials. the sign of  δesystem is negative.δesystem = efinal - einitial=-ve  efinal  ∠einitial.