Answered: A 7.298 g sample of copper reacts with…

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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Question

A 7.298 g sample of copper reacts with oxygen, forming a copper oxide. The final mass of the copper oxide is 8.217 g.

What is the formula of the copper oxide?

Expert Solution

Step 1

The formula of a compound can be determined by using the following steps

Find the number of moles of each element
Find the whole-number ratio by dividing the moles of each element by the smallest value of moles from the first step
If all the moles are whole number ratios, then formula can be written with the moles as the subscript of each element
If the moles are not whole number ratios, then multiply each of the moles by the smallest whole number that will convert each into a whole number.

Number of moles is given by

$N u m b e r o f m o l e s = \frac{G i v e n m a s s}{M o l a r m a s s}$

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