Question: I think we are solving for the rate constant but I am having trouble with knowing how to rearrange the integrated law equation to solve

I think we are solving for the rate constant but I am having trouble with knowing how to rearrange the integrated law equation to solve for k? I see similar questions posted but I do not end up with the same answers when walking through those examples on my calculator. :(

The gas phase decomposition of phosphine at 120C PH3(g)1/4P4(g)+3/2H2(g) is first order in PH3. In one experiment, when the initial concentration of PH3 was 0.0628M, the concentration of PH3 dropped to 1.44102M after 54.8 seconds had passed. Based on these data, the rate constant for the reaction is s1

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