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Chemistry: Structure and Properties
A mixture of NH3(g) and N2H4(g) is placed in a sealed container at 300 K. The total pressure is 0.50 atm. The container is heated to 1200 K, at which time both substances decompose completely according to the equations: 2 NH3(g) N2(g) + 3 H2(g); N2H4(g) N2(g) + 2 H2(g). After decomposition is complete, the total pressure at 1200 K is 4.5 atm. Find the percent of N2H4(g) in the original mixture. (Assume two significant figures for the temperature.)