The thermal decomposition of phosphine into phosphorus and molecular hydrogen is a first order reaction 4PH4 -----------> P4    +   6H2. The half life of the reaction is 35.0s at 680C .Calculate the time required for 95 percent of the phosphine(P4)  to decompose   Select one: a. 151 s b. 175s c. 0.98s d. 0.56 s

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