Table of contents

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

2. Atoms and the Periodic Table

Subatomic Particles (Simplified)

GOB Chemistry

2. Atoms and the Periodic Table

Subatomic Particles (Simplified)

Previous problemNext problem

Struggling with GOB Chemistry?

Join thousands of students who trust us to help them ace their exams!Watch the first video

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

Previous problemNext problem

Verified step by step guidance

First, understand that the problem requires converting the mass of sodium given in grams to the number of atoms. This involves using the molar mass of sodium and Avogadro's number.

Calculate the molar mass of sodium (Na). Sodium has an atomic mass of approximately 23.99 amu, which is equivalent to 23.99 g/mol.

Convert the given mass of sodium from grams to moles using the formula: \( \text{moles of Na} = \frac{\text{mass of Na in grams}}{\text{molar mass of Na}} \). Substitute the given values: \( \text{moles of Na} = \frac{0.230 \text{ g}}{23.99 \text{ g/mol}} \).

Use Avogadro's number to convert moles of sodium to atoms. Avogadro's number is \( 6.022 \times 10^{23} \text{ atoms/mol} \). Multiply the moles of sodium by Avogadro's number: \( \text{atoms of Na} = \text{moles of Na} \times 6.022 \times 10^{23} \text{ atoms/mol} \).

Perform the multiplication to find the number of atoms in 0.230 g of sodium. This will give you the final answer in terms of the number of atoms.