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34. The half-life of neptunium-231 is 50.0 min. How many minutes will it take for 5.0 g of this isotope to decay to 0.18 g? a. 1 x 102 x 102min b. 2.4 x 102 x 102 min c. 1.7 x 102 102 min d. 1.50 x 102 min e. 4.00× 10-min
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