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In lab, scientists often use percentages to describe concentration. When making a solution, percentage can be expressed as weight over volume (wt/vol) or as weight over weight (wt/wt). When expressing things as % (wt/wt) it usually assumed that 1 mL of water = 1 gram of water. This is similar to assuming molarity (mol/L) equals molality (mol/kg) In lab, 70% (wt/vol) ethanol is frequently used to sanitize the lab bench or research tools such as forceps. In order to produce a final volume of 767 mL of 70% (wt/vol) ethanol, how many mL of 93% (wt/vol) ethanol would you need to add? The percentages can be treated as a concentration. A solution that is 70% ethanol is 70 g of ethanol and 30 mL of water, or 70 g Ethanol out of 100 mL of solution. Therefore, it is possible to use m₁v₁ = m2v2 and use the percentages as the concentration values. Report your answer rounded to two decimal places

In lab, scientists often use percentages to describe concentration. When making a solution, percentage can be expressed as weight over volume (wt/vol) or as weight over weight (wt/wt). When expressing things as % (wt/wt) it usually assumed that 1 mL of water = 1 gram of water. This is similar to assuming molarity (mol/L) equals molality (mol/kg) In lab, 70% (wt/vol) ethanol is frequently used to sanitize the lab bench or research tools such as forceps. In order to produce a final volume of 767 mL of 70% (wt/vol) ethanol, how many mL of 93% (wt/vol) ethanol would you need to add? The percentages can be treated as a concentration. A solution that is 70% ethanol is 70 g of ethanol and 30 mL of water, or 70 g Ethanol out of 100 mL of solution. Therefore, it is possible to use m₁v₁ = m2v2 and use the percentages as the concentration values. Report your answer rounded to two decimal places

Chemistry
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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In lab, scientists often use percentages to describe concentration. When making a solution, percentage can be expressed as weight over volume (wt/vol) or as weight over weight (wt/wt). When expressing things as % (wt/wt) it usually assumed that 1 mL of water = 1 gram of water. This is similar to assuming molarity (mol/L) equals molality (mol/kg) In lab, 70% (wt/vol) ethanol is frequently used to sanitize the lab bench or research tools such as forceps. In order to produce a final volume of 767 mL of 70% (wt/vol) ethanol, how many mL of 93% (wt/vol) ethanol would you need to add? The percentages can be treated as a concentration. A solution that is 70% ethanol is 70 g of ethanol and 30 mL of water, or 70 g Ethanol out of 100 mL of solution. Therefore, it is possible to use m₁v₁ = m2v2 and use the percentages as the concentration values. Report your answer rounded to two decimal places
Transcribed Image Text:In lab, scientists often use percentages to describe concentration. When making a solution, percentage can be expressed as weight over volume (wt/vol) or as weight over weight (wt/wt). When expressing things as % (wt/wt) it usually assumed that 1 mL of water = 1 gram of water. This is similar to assuming molarity (mol/L) equals molality (mol/kg) In lab, 70% (wt/vol) ethanol is frequently used to sanitize the lab bench or research tools such as forceps. In order to produce a final volume of 767 mL of 70% (wt/vol) ethanol, how many mL of 93% (wt/vol) ethanol would you need to add? The percentages can be treated as a concentration. A solution that is 70% ethanol is 70 g of ethanol and 30 mL of water, or 70 g Ethanol out of 100 mL of solution. Therefore, it is possible to use m₁v₁ = m2v2 and use the percentages as the concentration values. Report your answer rounded to two decimal places
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