A mixture of NH 3 (g) and N 2 H 4 (g) is placed in a sealed

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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) N(g) + 3 H(g); NH4(8) N(g) + 2 H(g).

After decomposition is complete, the total pressure at 1200 K is found to be 4.5 atm. Find the percent of N2H4(g) in the original mixture. (Assume two significant figures for the temperature.)

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