The reactant concentration in a zero-order reaction was 6.00×10−2 M after 150 s and 4.00×10−2 M after 360 s . What is th

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The reactant concentration in a zero-order reaction was
6.00×10−2 M after 150 s and
4.00×10−2 M after 360 s . What is
the rate constant for this reaction?
Express your answer with the appropriate units. Indicate the
multiplication of units, as necessary, explicitly either with a
multiplication dot or a dash.
Answer:
k0th =
9.52×10−5 M/s
Actual Question:
What was the initial reactant concentration for the reaction
described in Part A?
Express your answer with the appropriate units. Indicate the
multiplication of units, as necessary, explicitly either with a
multiplication dot or a dash.