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 calculate the mean rate of the reaction up to the time the reaction is complete. Give your answer to three significant figures. – 6171

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1. Mass lost = 2.2 g
   Time taken = 270 seconds

   To find the rate, use:

   Rate = Mass lost / Time taken = 2.2 / 270

   = 0.00815 g/s (to 3 significant figures)
   =0.00815g/s(to 3 significant figures)

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