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1. Matter and Measurements4h 31m
2. Atoms and the Periodic Table5h 23m
3. Ionic Compounds2h 18m
4. Molecular Compounds2h 18m
5. Classification & Balancing of Chemical Reactions3h 17m
6. Chemical Reactions & Quantities2h 27m
7. Energy, Rate and Equilibrium3h 46m
8. Gases, Liquids and Solids3h 25m
9. Solutions4h 10m
10. Acids and Bases3h 29m
11. Nuclear Chemistry56m
BONUS: Lab Techniques and Procedures1h 38m
BONUS: Mathematical Operations and Functions47m
12. Introduction to Organic Chemistry1h 34m
13. Alkenes, Alkynes, and Aromatic Compounds2h 12m
14. Compounds with Oxygen or Sulfur1h 6m
15. Aldehydes and Ketones1h 1m
16. Carboxylic Acids and Their Derivatives1h 11m
17. Amines39m
18. Amino Acids and Proteins1h 51m
19. Enzymes1h 37m
20. Carbohydrates1h 41m
21. The Generation of Biochemical Energy2h 8m
22. Carbohydrate Metabolism2h 22m
23. Lipids2h 26m
24. Lipid Metabolism1h 45m
25. Protein and Amino Acid Metabolism1h 37m
26. Nucleic Acids and Protein Synthesis2h 54m

6. Chemical Reactions & Quantities

Mole Concept

GOB Chemistry

6. Chemical Reactions & Quantities

Mole Concept

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Multiple Choice

If the density of water is 1.00 g/mL at 25°C, calculate the number of water molecules found in 1.50 x 10³ µL of water.

3.993 x 10²¹ molecules

5.013 x 10²² molecules

7.411 x 10²³ molecules

6.291 x 10²⁴ molecules

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Verified step by step guidance

Convert the volume of water from microliters (µL) to milliliters (mL). Since 1 mL = 1000 µL, divide the given volume by 1000.

Use the density of water to find the mass of the water. Multiply the volume in mL by the density (1.00 g/mL) to get the mass in grams.

Convert the mass of water to moles. Use the molar mass of water (approximately 18.02 g/mol) and divide the mass by this molar mass to find the number of moles.

Calculate the number of water molecules using Avogadro's number (6.022 x 10^23 molecules/mol). Multiply the number of moles by Avogadro's number to find the total number of molecules.

Review the calculations to ensure all unit conversions and multiplications are correct, and compare the result with the given options to identify the correct answer.