**Transcription for Educational Website:**---**3. What is the mass percent of a solution made by adding 22.3 g of NaOH to 100.0 g of water?**Calculation:\[\text{Mass percent} = \left(\frac{22.3 \, \text{g NaOH}}{22.3 \, \text{g NaOH} + 100.0 \, \text{g H}_2\text{O}}\right) \times 100\]\[= 18.2\%\]**4. How many grams of water must be added to 15.0 g NaCl to make a solution that is 10.0% (m/m)?**---The text provides an example of calculating mass percent for a sodium hydroxide (NaOH) solution and introduces a problem about creating a specific concentration of a sodium chloride (NaCl) solution.

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How many grams of water must be added to 15.0 g NaCl to make a solution that is 10.0%(m/m)?

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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Concept explainers

Solutions

Solutions can be considered as homogeneous mixtures which contain two or more than two chemical substances. The chemical substance which is the greater part is defined as solvent. And the chemical substance that is dissolved in a solvent is referred to as solute. Solution chemistry plays an important role in chemistry since it supports many commercial applications of solutions.

Question

**Transcription for Educational Website:**

---

**3. What is the mass percent of a solution made by adding 22.3 g of NaOH to 100.0 g of water?**

Calculation:
\[
\text{Mass percent} = \left(\frac{22.3 \, \text{g NaOH}}{22.3 \, \text{g NaOH} + 100.0 \, \text{g H}_2\text{O}}\right) \times 100
\]
\[
= 18.2\%
\]

**4. How many grams of water must be added to 15.0 g NaCl to make a solution that is 10.0% (m/m)?**

---

The text provides an example of calculating mass percent for a sodium hydroxide (NaOH) solution and introduces a problem about creating a specific concentration of a sodium chloride (NaCl) solution.

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