Table of contents

1. Intro to General Chemistry3h 48m
2. Atoms & Elements4h 16m
3. Chemical Reactions4h 10m
4. BONUS: Lab Techniques and Procedures1h 36m
5. BONUS: Mathematical Operations and Functions48m
6. Chemical Quantities & Aqueous Reactions3h 53m
7. Gases3h 49m
8. Thermochemistry2h 37m
9. Quantum Mechanics2h 58m
10. Periodic Properties of the Elements3h 9m
11. Bonding & Molecular Structure3h 29m
12. Molecular Shapes & Valence Bond Theory1h 57m
13. Liquids, Solids & Intermolecular Forces2h 23m
14. Solutions3h 1m
15. Chemical Kinetics2h 53m
16. Chemical Equilibrium2h 29m
17. Acid and Base Equilibrium5h 1m
18. Aqueous Equilibrium4h 47m
19. Chemical Thermodynamics1h 50m
20. Electrochemistry2h 42m
21. Nuclear Chemistry2h 36m
22. Organic Chemistry5h 7m
23. Chemistry of the Nonmetals2h 39m
24. Transition Metals and Coordination Compounds3h 16m

3. Chemical Reactions

Empirical Formula

General Chemistry

3. Chemical Reactions

Empirical Formula

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Multiple Choice

A sample of an unknown compound was decomposed and found to be composed of 1.36 mol of oxygen, 4.10 mol of hydrogen, and 2.05 mol of carbon. What is the empirical formula of the unknown compound?

CH2O

C2H4O

C2H5O

C3H6O2

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Verified step by step guidance

Start by identifying the number of moles of each element present in the compound: Oxygen (O) = 1.36 mol, Hydrogen (H) = 4.10 mol, Carbon (C) = 2.05 mol.

To find the empirical formula, divide the number of moles of each element by the smallest number of moles present among the elements. In this case, the smallest number of moles is 1.36 mol (Oxygen).

Calculate the ratio for each element: \( \frac{1.36}{1.36} \) for Oxygen, \( \frac{4.10}{1.36} \) for Hydrogen, and \( \frac{2.05}{1.36} \) for Carbon.

Round the ratios to the nearest whole number to determine the subscripts for each element in the empirical formula. If any ratio is not a whole number, multiply all ratios by the same factor to achieve whole numbers.

Combine the elements with their respective subscripts to write the empirical formula of the compound.