1.600 mole of ammonia gas is placed in a 1600.cm^3 box at 25.0 degrees . The box is then heated to 500K, which causes the ammonia to partially decompose to Nitrogen and Hydrogen and results in a final pressure of 4.85*10^6 pa. Find the number of moles and partial pressure of all three gases at 500K. What is the average molar mass of the gas mixture.