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1. The Chemical World9m
- The Scientific Method
  9m
2. Measurement and Problem Solving2h 19m
3. Matter and Energy2h 15m
4. Atoms and Elements2h 33m
5. Molecules and Compounds1h 50m
6. Chemical Composition1h 23m
7. Chemical Reactions1h 43m
8. Quantities in Chemical Reactions1h 8m
9. Electrons in Atoms and the Periodic Table2h 32m
10. Chemical Bonding2h 10m
11 Gases2h 7m
12. Liquids, Solids, and Intermolecular Forces1h 11m
13. Solutions3h 1m
14. Acids and Bases2h 14m
15. Chemical Equilibrium1h 27m
16. Oxidation and Reduction1h 33m
17. Radioactivity and Nuclear Chemistry53m

6. Chemical Composition

Mole Concept

Introduction to Chemistry

6. Chemical Composition

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 from microliters (µL) to milliliters (mL). Since 1 mL = 1000 µL, divide the given volume by 1000 to get the volume in mL.

Use the density of water to find the mass of water. Multiply the volume in mL by the density (1.00 g/mL) to obtain 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 of water by this molar mass to find the number of moles.

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

Review the calculation steps to ensure each conversion and multiplication is correctly applied, and verify the units at each stage to confirm the accuracy of the process.