(a) Repeat Exercise 31 57 but include the 0 0055 natural abundance of 234 U with its 2 45 x 10 5 y half life (b) What is unreasonable about this result (c) What assumption is responsible (d) Where does the 234 U come from if it is not primordial Data from Exercise 31 57 Natural uranium is 0 7200 23...

a Repeating Exercise 3157 with 234U Given Abundance of 235U 07200 Abundance of 238U 9927 Abundance o ...

(a) Repeat Exercise 31.57 but include the 0.0055% natural abundance of 234 U with its 2.45 x...

Question:

(a) Repeat Exercise 31.57 but include the 0.0055% natural abundance of ²³⁴U with its 2.45 x 10⁵ y half-life.

(b) What is unreasonable about this result?

(d) Where does the²³⁴U come from if it is not primordial?

Data from Exercise 31.57

Natural uranium is 0.7200% ²³⁵U and 99.27% ²³⁸U. What were the percentages of ²³⁵U and ²³⁸U in natural uranium when Earth formed 4.5 x 10⁹ years ago?

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(a) Repeat Exercise 31.57 but include the 0.0055% natural abundance of 234 U with its 2.45 x...

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