Answer:
The plot [R] vs time is shown below
(Since 1 mol/L=1M)
Rate = ΔC/ Δt=|C2-C1|/(t2-t1)
Rate (t=0s to t=15s)=|Ct=15s - Ct=0s|/(15s-0s)=|(0.00478 M - 0.006 M)|/(15s)
Rate (t=0s to t=15s)=8.133 x 10-5 M/s
Rate (t=100s to t=125s)=|Ct=125s - Ct=100s|/(125s-100s)=|(0.000957 M - 0.00136 M)|/(25s)
Rate (t=100s to t=125s)=1.612 x 10-5 M/s.
Please let me know if you have any doubts. Thanks.
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