Water can be broken down via electrolysis according to the reaction,
2 H2O (l) --> 2 H2 (g) + O2 (g)
Calculate the pressure exerted by O2 when 2.676 g of water is completely broken down and the gases are collected in a 1.668 L container at 25 oC. Hint: calculate the number of moles of O2 produced first. (Do not put units in answer)