Table of contents

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

4. Atoms and Elements

Subatomic Particles (Simplified)

Introduction to Chemistry

4. Atoms and Elements

Subatomic Particles (Simplified)

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Multiple Choice

How many atoms are contained in 0.230 g of sodium, Na? The mass of one sodium atom is 23.99 amu.

7.197 x 10¹¹

4.182 x 10³

5.775 x 10²¹

9.181 x 10⁴¹

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Verified step by step guidance

First, understand that the problem requires you to find the number of atoms in a given mass of sodium. To do this, you need to use the concept of moles and Avogadro's number.

Calculate the number of moles of sodium in 0.230 g. Use the molar mass of sodium, which is approximately 23.99 g/mol. The formula to find moles is: \( \text{moles} = \frac{\text{mass (g)}}{\text{molar mass (g/mol)}} \).

Once you have the number of moles, use Avogadro's number to find the number of atoms. Avogadro's number is \( 6.022 \times 10^{23} \) atoms/mol. Multiply the number of moles by Avogadro's number to get the number of atoms: \( \text{atoms} = \text{moles} \times 6.022 \times 10^{23} \).

Ensure that your units are consistent throughout the calculation. The mass should be in grams, the molar mass in grams per mole, and the final result will be in atoms.

Review the calculation steps to ensure accuracy and check that the final number of atoms matches one of the provided options.