Question

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.

Answer 1

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.