Today, in the element Uranium, the mole fraction of the 238U isotope with a half-life of 4.51 * 10 9 years is 0.9928 and the mole fraction of the 235U isotope with a half-life of 7.0 * 108 years is 0.0072. Find how many years ago the mole fractions of two isotopes were equal to each other.

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Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Today, in the element Uranium, the mole fraction of the ²³⁸U isotope with a half-life of 4.51 * 10 ⁹ years is 0.9928 and the mole fraction of the ²³⁵U isotope with a half-life of 7.0 * 10⁸ years is 0.0072. Find how many years ago the mole fractions of two isotopes were equal to each other.

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