Phosphine gas (PH3), decomposes by the reaction shown below.  A total pressure of 0.64 atm of pure phosphine gas was placed in a sealed 1.00-L flask at 298 K. After equilibrium was attained, the total pressure inside the flask was found to be 0.93 atm. Calculate the mass of solid phosphorous in the flask. PH3(g)   <-->   P(s)   +   3 H2(g)

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