Table of contents

1. Intro to General Chemistry3h 48m
2. Atoms & Elements4h 16m
3. Chemical Reactions4h 10m
4. BONUS: Lab Techniques and Procedures1h 38m
5. BONUS: Mathematical Operations and Functions48m
6. Chemical Quantities & Aqueous Reactions3h 53m
7. Gases3h 49m
8. Thermochemistry2h 37m
9. Quantum Mechanics2h 58m
10. Periodic Properties of the Elements3h 9m
11. Bonding & Molecular Structure3h 29m
12. Molecular Shapes & Valence Bond Theory1h 57m
13. Liquids, Solids & Intermolecular Forces2h 23m
14. Solutions3h 1m
15. Chemical Kinetics2h 53m
16. Chemical Equilibrium2h 29m
17. Acid and Base Equilibrium5h 1m
18. Aqueous Equilibrium4h 47m
19. Chemical Thermodynamics1h 50m
20. Electrochemistry2h 42m
21. Nuclear Chemistry2h 36m
22. Organic Chemistry5h 7m
23. Chemistry of the Nonmetals2h 39m
24. Transition Metals and Coordination Compounds3h 16m

6. Chemical Quantities & Aqueous Reactions

Molarity

General Chemistry

6. Chemical Quantities & Aqueous Reactions

Molarity

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Multiple Choice

Calculate the number of grams of KOH in 250.0 mL of a 0.189 M solution.

2.65 grams

0.95 grams

3.78 grams

1.35 grams

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Verified step by step guidance

Start by understanding the concept of molarity, which is defined as the number of moles of solute per liter of solution. The formula for molarity (M) is:

M = \frac{n}{V}

, where

n

is the number of moles and

V

is the volume in liters.

Convert the volume of the solution from milliliters to liters. Since there are 1000 milliliters in a liter, divide 250.0 mL by 1000 to get the volume in liters:

250.0 / 1000 = 0.250

Use the molarity formula to find the number of moles of KOH in the solution. Rearrange the formula to solve for

n

n = M \times V

. Substitute the given values:

0.189 \times 0.250

Calculate the molar mass of KOH. Potassium (K) has a molar mass of approximately 39.10 g/mol, oxygen (O) is about 16.00 g/mol, and hydrogen (H) is about 1.01 g/mol. Add these together to find the molar mass of KOH: