   Chapter 31, Problem 66PE

Chapter
Section
Textbook Problem

Data from the appendices and the periodic table may be needed for these problems.Unreasonable ResultsA nuclear physicist finds 1.0 (g of 236U in a piece of uranium ore and assumes ii is primordial since its half−life is 2.3 × 10 7 y . (a) Calculate the amount at 236U that would had to have been on Earth when it formed 4.5 × 10 9 y ago for 1.0 (g to be left today. (b) What is unreasonable about this result? (c) What assumption is responsible?

To determine

(a)

The initial amount of 236U

Explanation

Given info:

The half life of 236U

t12=2.3×107y

The mass of 236U left

m=1.0μg=1.0×106g

Time taken to formed 236U is

t=4.5×109y

Formula used:

To calculate mass the formula is used,

m=moe0.693tt 1/2

Calculation:

Substituting the values

m=(1

b)

To determine

The unreasonable in result.

(c)

To determine

The cause of unreasonable in result.

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