Chemistry
Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Would love some help! I don't know how to calculate if it is pure or mixture in these questions.

A sample of an unknown pure substance \( X \) is analyzed and found to contain 9.34 g of Element \( E_1 \), 10.7 g of Element \( E_2 \), and no other elements. A similar analysis is made of three other substances that also only contain Elements \( E_1 \) and \( E_2 \). The results are shown in the table below. Decide whether each of the other substances is also a pure substance. If you don't have enough information to decide, choose can’t decide. | substance | mass of \( E_1 \) | mass of \( E_2 \) | pure substance? | |-----------|-------------------|-------------------|-----------------| | \( A \) | 28.0 g | 16.0 g | ○ pure substance<br>○ mixture<br>○ (can’t decide) | | \( B \) | 42.8 g | 12.2 g | ○ pure substance<br>○ mixture<br>○ (can’t decide) | | \( C \) | 22.5 g | 8.55 g | ○ pure substance<br>○ mixture<br>○ (can’t decide) |
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Transcribed Image Text:A sample of an unknown pure substance \( X \) is analyzed and found to contain 9.34 g of Element \( E_1 \), 10.7 g of Element \( E_2 \), and no other elements. A similar analysis is made of three other substances that also only contain Elements \( E_1 \) and \( E_2 \). The results are shown in the table below. Decide whether each of the other substances is also a pure substance. If you don't have enough information to decide, choose can’t decide. | substance | mass of \( E_1 \) | mass of \( E_2 \) | pure substance? | |-----------|-------------------|-------------------|-----------------| | \( A \) | 28.0 g | 16.0 g | ○ pure substance<br>○ mixture<br>○ (can’t decide) | | \( B \) | 42.8 g | 12.2 g | ○ pure substance<br>○ mixture<br>○ (can’t decide) | | \( C \) | 22.5 g | 8.55 g | ○ pure substance<br>○ mixture<br>○ (can’t decide) |
An analytical chemist measures the amount of Elements \(E_1\) and \(E_2\) in four samples of an unknown Substance \(X\): | sample | mass of \(E_1\) | mass of \(E_2\) | |--------|-----------------|-----------------| | 1 | 2.7 g | 9.3 g | | 2 | 4.7 g | 16.3 g | | 3 | 5.6 g | 19.3 g | | 4 | 4.0 g | 13.9 g | It's known that \(X\) contains no elements other than \(E_1\) and \(E_2\). Using this information, answer the questions in the table below. 1. Is \(X\) a pure substance or a mixture? - pure substance - mixture - (can't decide) 2. If you said \(X\) is a pure substance, calculate the mass of Element \(E_1\) the analytical chemist would find in a new 10.0 g sample of \(X\). (Round your answer to 2 significant digits.) \(\_\_\_\_\_\_\) g
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Transcribed Image Text:An analytical chemist measures the amount of Elements \(E_1\) and \(E_2\) in four samples of an unknown Substance \(X\): | sample | mass of \(E_1\) | mass of \(E_2\) | |--------|-----------------|-----------------| | 1 | 2.7 g | 9.3 g | | 2 | 4.7 g | 16.3 g | | 3 | 5.6 g | 19.3 g | | 4 | 4.0 g | 13.9 g | It's known that \(X\) contains no elements other than \(E_1\) and \(E_2\). Using this information, answer the questions in the table below. 1. Is \(X\) a pure substance or a mixture? - pure substance - mixture - (can't decide) 2. If you said \(X\) is a pure substance, calculate the mass of Element \(E_1\) the analytical chemist would find in a new 10.0 g sample of \(X\). (Round your answer to 2 significant digits.) \(\_\_\_\_\_\_\) g
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