Figure 4 shows the results for 50 cm³ of 2.0 mol/dm³ hydrogen peroxide solution and 1.0 g of manganese dioxide. A tangent to the line has been drawn at 75 seconds. Total mass lost in grams 1.80 1.60 1.40- 1.20 1.00- 0.80- 0.60 0.40- 0.20 0.00- 0 25 Figure 4 50 75 100 125 150 175 200 Time in seconds Determine the rate of reaction when the time was 75 seconds.
