Another student investigated the rate of reaction by measuring the change in mass. Figure 3 shows the graph plotted from this student’s results. Use Figure 3 to determine the rate of reaction at 150 seconds. Show your working on Figure 3. Give your answer in standard form. – 6172

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1. I drew a correct tangent to the curve on the graph.

   Then I used the gradient formula:

   Rate = change in y / change in x = 0.35 / 50

   = 0.007 (g/s)

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