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# Concentration of Solutions Problems

Test your understanding of concentration units in solutions with problems involving percent by mass, percent by volume, mole fraction, molarity, and molality. Practice calculating the percent by mass of various solutes in different solution scenarios.

Created by
@FruitfulNirvana

### Which of the following is the correct formula for calculating percent by mass?

$rac{ ext{Mass of solute}}{ ext{Mass of solution}} imes 100$

37.5%

33.3%

### In Sample Problem 3, what is the percent by mass of ammonium nitrate in the solution?

<p>16.5%</p> Signup and view all the answers

### What is the percent by volume of the isopropanol and water solution in Sample Problem 3?

<p>45.5%</p> Signup and view all the answers

### What is the typical percent by volume of alcohol in beer?

<p>5.0%</p> Signup and view all the answers

### Which of the following is the correct formula for calculating the mole fraction of the solute in a solution?

<p>$x_{solute} = \frac{moles\ solute}{moles\ solute + moles\ solvent}$</p> Signup and view all the answers

### What is the relationship between the mole fractions of the solute and solvent in a solution?

<p>The sum of the mole fractions of the solute and solvent is always equal to 1.</p> Signup and view all the answers

### What is the molarity of a solution that contains 0.75 mol of solute dissolved in 2.50 L of solution?

<p>1.88 M</p> Signup and view all the answers

### A solution contains 6.60 grams of C6H12O6 in 150.0 mL of solution. What is the molarity of this solution?

<p>2.20 M</p> Signup and view all the answers

### What is the molarity of a 45% by mass aqueous CaCl2 solution with a density of 1.2 g/mL? The molar mass of CaCl2 is 111 g/mol.

<p>3.06 M</p> Signup and view all the answers

### What is the molality of a solution that contains 12.5 grams of NaOCl in 1000 mL of solution?

<p>1.11 m</p> Signup and view all the answers

### What is the mole fraction of HCl in an aqueous solution that contains 44.2 grams of HCl and 88.6 grams of H2O?

<p>0.20</p> Signup and view all the answers

### A solution is prepared by dissolving 4.5 g of methanol (CH3OH) in 40 g of water. What is the mole fraction of methanol in this solution?

<p>0.10</p> Signup and view all the answers

### A hydrochloric acid (HCl) solution contains 30% HCl by weight. What is the mole fraction of HCl in this solution?

<p>0.40</p> Signup and view all the answers

### What is the mole fraction of MgBr2 and H2O in a solution that contains 28.67 moles of MgBr2 and 90.71 moles of H2O?

<p>0.24 and 0.76</p> Signup and view all the answers

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