20% of decomposition of H2 O2 in presence of an acid request 5 minutes the time required for 50% decomposition in minutes

decomposition of h2o2 follows first order reaction. In fifty minutes the concentration of h2o2 decrease from 0.5 to 0.125M in one such decomposition. When the concentration of h2o2 reaches 0.05M , the rate of formation of o2 will be
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