19. lodine-123, used in thyroid therapy, has a half-ife of 13.27 hours. How many half-lives are required for a 160 mg sample of iodine-123 to decay to 5.0 mg? (A)0.031 (B)1.0 (C)5.0 (D)32

19. lodine-123, used in thyroid therapy, has a half-ife of 13.27 hours. How many half-lives are required for a 160 mg sample of iodine-123 to decay to 5.0 mg?
(A)0.031
(B)1.0
(C)5.0
(D)32

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統計： A(0), B(0), C(5), D(1), E(0) #2740172

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B1 · 2023/08/08

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18. Using the following standard reduction potentials calculate the standard cell potential for the galvanic cell reaction given below, and determine whether or not this reaction is spontaneous under standard conditions. Pb2+(aq) + 2 Fe2+(aq) → 2 Fe3+(aq)+ Pb(s) (A)E°= -0.90 V, nonspontaneous (B)E°= -0.90 V, spontaneous (C)E° = +0.90 V, nonspontaneous (D)E° = +0.90 V, spontaneous

19. lodine-123, used in thyroid therapy, has a half-ife of 13.27 hours. How many half-lives are required for a 160 mg sample of iodine-123 to decay to 5.0 mg? (A)0.031 (B)1.0 (C)5.0 (D)32

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19. lodine-123, used in thyroid therapy, has a half-ife of 13.27 hours. How many half-lives are required for a 160 mg sample of iodine-123 to decay to 5.0 mg?
(A)0.031
(B)1.0
(C)5.0
(D)32