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At high temperatures phosphine PH3 dissociates into phosphorus and hydrogen by the following reaction 4PH₃一P₄ + 6H₂ At 800° C the rate at which phosphine dissociates is "严=—3.715 ₓ 10~⁶C，ph₃ dt for t in seconds. The reaction occurs in a constant volume, 2-liter vessel, and the initial concentration of phosphine is 5 kmol/m³ a. If 3 mols 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 and any time, and determine how long it would take for 3 mols of phosphine to have reacted.