The gas arsine, AsH3, decomposes as follows: 2AsH3(g) ⇄ 2As(s) + 3H2(g) In an experiment at a certain temperature, pure AsH3(g) was placed in an empty, rigid, sealed flask at a pressure of 389.0 torr. After 48 hours the pressure in the flask was observed to be constant at 486.0 torr. Calculate the equilibrium pressure of H2(g). Pressure =  ? atm

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