2. From a 0.0800 g sample of ore, uranium was transferred to U4 and titrated with 0.01 N KMnO4. What is the mass content of U4 in the ore according to the following results of potentiometric titration:
V(KMnO4), ml 2.0 10.0 16.0 17.8 18.0 18.2 20.0
E, mV 301 330 359 389 1170 1480 1500
Chemical reaction equation:
5U4 2 MnO4- 2H2O=2Mn2 5UO22 4H .

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