Problem 13.040 si a mixture of 1 kmol of hydrogen (h2) and n kmol of oxygen (o2), initially at 25°c and 1 atm, burns completely in a closed, rigid, insulated container. the container finally holds a mixture of water vapor and o2 at 3000 k. the ideal gas model applies to each mixture and there is no change in kinetic or potential energy between the initial and final states. determine: (a) the value of n. (b) the final pressure, in atm.