A mixture of 7.6 mol of H2(g) and 3.8 mol of O2(g) is placed in a sealed evacuated container made of a perfect insulating material at 25 ∘C . The mixture is ignited with a spark and it reacts to form liquid water. [Cs(H2O(l))=4.18J/(g⋅∘C) , Cs(H2O(g))=2.04J/(g⋅∘C)] H2(g) 12O2(g)→H2O(l),ΔrH∘=−285.8kJ/mol H2O(l)→H2O(g),ΔrH∘=44.01kJ/mol. Find the temperature of the water.