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Results - rate of reaction by mass loss

Time/s

mt/g

mfinal - mt/g

0

0

0.381

30

0.064

0.317

60

0.126

0.255

90

0.173

0.208

120

0.215

0.166

150

0.247

0.134

180

0.270

0.111

210

0.292

0.089

240

0.305

0.057

¥

0.381

0

View graph

As you will see, the half-life is approximately constant indicating that this reaction is a first order one.