Question- At a fixed temperature, equal moles of H2 (g) and O2 (g) are mixed in a constant pressure container (the volume of the container changes in order to keep the pressure at a constant value). The H2 (g) and O2 (g) are allowed to react, producing H2O (g):

2 H2 (g) + O2 (g) ? 2 H2O (g)

If the initial volume of the container, before any reaction takes place, is 2.50 L, determine the volume of the container after the H2 (g) and O2 (g) have reacted to completion.

What will the final volume be in L?

Thank you! My final is tomorrow and I am in desperate need!