In 004 m naoh at 20c the decomposition of h2o2 and o2 is, Ask an Expert

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In 0.04 M NaOH at 20*C, the decomposition of H2O2 and O2 is first order. If the half-life is 654 minutes, what would be the concentration after 100.00 minutes of a solution initially at 0.200 M?

Please explain as my teacher just did a problem and didn't even try to explain it and we will be having it on our mid term on Friday

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