At 25 degrees celsius 12m h2o2 is decomposed. after 30 minutes the concentration of the h2o2 is found to be 9.5m. what is the average reaction rate for this decomposition reaction? i did it and got 0.083, just wanted to check to make sure i did it right.

Yes you got the magnitude (value) right. Assuming a first-order reaction. The rate is equal to the change in concentration over change in time. Since the concentration is decreasing, we are expecting a negative value. A value of - 0.0833 mol/ L-min (moles per liter per minute) is the rate.

1. o2(g)as a product