At high temperatures phosphine (PH₃) dissociates into phosphorus and hydrogen by the following reaction:

for t in seconds. The reaction occurs in a constantvolume, 2-L vessel, and the initial concentration of phosphine is 5 kmol/m³

a. If 3 mol of the phosphine reacts, how much phosphorus and hydrogen are produced? 

b. Develop expressions for the number of moles of phosphine, phosphorus, and hydrogen present at any time, and determine how long it would take for 3 mol of phosphine to have reacted.

Transcribed Image Text:

4PH3 →→→→ P4 + 6H₂ At 800°C the rate at which phosphine dissociates is dCPH 3 dt = -3.715 x 10-6CPH3