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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

5. Classification & Balancing of Chemical Reactions

Law of Conservation of Mass

GOB Chemistry

5. Classification & Balancing of Chemical Reactions

Law of Conservation of Mass

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Multiple Choice

Following the Law of Conservation of Mass, predict the minimum amount of nitrogen that will react with 50.0 grams of hydrogen to produce 92.5 grams of ammonia.
Nitrogen + Hydrogen → Ammonia

42.5 g

45.91 g

46.25 g

50.0 g

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Verified step by step guidance

Start by writing the balanced chemical equation for the reaction: N_2 + 3H_2 → 2NH_3.

Apply the Law of Conservation of Mass, which states that the mass of reactants must equal the mass of products. Here, the total mass of nitrogen and hydrogen must equal the mass of ammonia produced.

Calculate the total mass of reactants needed. Since 92.5 grams of ammonia is produced, the combined mass of nitrogen and hydrogen must also be 92.5 grams.

Subtract the mass of hydrogen from the total mass of reactants to find the mass of nitrogen. Given that 50.0 grams of hydrogen is used, subtract this from 92.5 grams.

The result from the subtraction will give you the minimum amount of nitrogen required to react with 50.0 grams of hydrogen to produce 92.5 grams of ammonia.