# Natural uranium ore contains about 0.720% of the fissile uranium-235 isotope. Suppose a sample of uranium ore contains 2.50 × 10 28 uranium nuclei. Determine the number of uranium-235 nuclei in the sample.

### College Physics

11th Edition
Raymond A. Serway + 1 other
Publisher: Cengage Learning
ISBN: 9781305952300

Chapter
Section

### College Physics

11th Edition
Raymond A. Serway + 1 other
Publisher: Cengage Learning
ISBN: 9781305952300
Chapter 30, Problem 1P
Textbook Problem
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## Natural uranium ore contains about 0.720% of the fissile uranium-235 isotope. Suppose a sample of uranium ore contains 2.50 × 1028 uranium nuclei. Determine the number of uranium-235 nuclei in the sample.

To determine
The number of uranium-235 nuclei in the sample.

### Explanation of Solution

Given Info:

The amount of uranium-235 isotope in natural uranium ore is 0.720% .

The number of uranium nuclei is 2.50×1028 .

Formula to calculate the number of uranium 235 nuclei is,

N=Δpn

• Δp is the amount of uranium-235 isotope in natural uranium ore
• N is the number of uranium-235 nuclei
• n is the number of uranium nuclei

Substitute 0.720% for Δp and 2.50×1028 for n to find N

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