Question

The decomposition of phosphine, PH3, follows first-order kinetics.
4 PH3(g) P4(g) + 6 H2(g)
The half-life for the reaction at 550 C is 81.3 seconds. What percentage of phosphine remains after 195 seconds?
A.2.2%
B.9.8%
C.19%
D.42%
E.58%

Answer

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