A sample of gaseous arsine (AsH3) in a 513 mL flask at 311 Torr and 203 K, is heated to 417 K, at which temperature arsine

Question

A sample of gaseous arsine (AsH3) in a 513 mL flask at 311 Torr and 203 K, is heated to 417 K, at which temperature arsine decom- poses to solid arsenic and hydrogen gas. The flask is then cooled to 253 K, at which tem- perature the pressure in the flask is 539 Torr. What percentage of arsine molecules have de- composed? Answer in units of %.

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