Understanding the Molecular Formula of CS2

Oct 13, 2025 by wbrum.org 24 views

Introduction

In chemistry, understanding the number of moles of atoms in a given substance is crucial for various calculations and reactions. The molecular formula of carbon disulfide (CS2) is composed of one carbon atom and two sulfur atoms. In this article, we will calculate the number of moles of carbon atoms in 50.0 g of CS2.

Understanding the Molecular Formula of CS2

The molecular formula of CS2 is C-S-S, indicating that it consists of one carbon atom and two sulfur atoms. The atomic mass of carbon (C) is 12.01 g/mol, and the atomic mass of sulfur (S) is 32.07 g/mol.

Calculating the Molar Mass of CS2

To calculate the number of moles of carbon atoms in CS2, we first need to determine the molar mass of CS2. The molar mass of CS2 can be calculated by adding the atomic masses of carbon and two sulfur atoms.

Molar mass of CS2 = Atomic mass of C + 2 x Atomic mass of S Molar mass of CS2 = 12.01 g/mol + 2 x 32.07 g/mol Molar mass of CS2 = 12.01 g/mol + 64.14 g/mol Molar mass of CS2 = 76.15 g/mol

Calculating the Number of Moles of CS2

Now that we have the molar mass of CS2, we can calculate the number of moles of CS2 in 50.0 g of the substance. We will use the formula:

Number of moles = Mass of substance / Molar mass Number of moles = 50.0 g / 76.15 g/mol Number of moles = 0.655 mol

Calculating the Number of Moles of Carbon Atoms

Since the molecular formula of CS2 consists of one carbon atom, the number of moles of carbon atoms is equal to the number of moles of CS2.

Number of moles of carbon atoms = Number of moles of CS2 Number of moles of carbon atoms = 0.655 mol

Conclusion

In conclusion, we have calculated the number of moles of carbon atoms in 50.0 g of CS2. The molar mass of CS2 was first calculated by adding the atomic masses of carbon and two sulfur atoms. Then, the number of moles of CS2 was calculated using the formula: Number of moles = Mass of substance / Molar mass. Finally, the number of moles of carbon atoms was determined to be equal to the number of moles of CS2.

Frequently Asked Questions

Q: What is the molecular formula of CS2? A: The molecular formula of CS2 is C-S-S, indicating that it consists of one carbon atom and two sulfur atoms.

Q: What is the atomic mass of carbon? A: The atomic mass of carbon is 12.01 g/mol.

Q: What is the atomic mass of sulfur? A: The atomic mass of sulfur is 32.07 g/mol.

Q: How do you calculate the molar mass of CS2? A: The molar mass of CS2 can be calculated by adding the atomic masses of carbon and two sulfur atoms.

Q: How do you calculate the number of moles of CS2? A: The number of moles of CS2 can be calculated using the formula: Number of moles = Mass of substance / Molar mass.

References

"Atomic Masses of the Elements" by the National Institute of Standards and Technology (NIST)
"Molecular Formula" by Wikipedia
"Molar Mass" by Chemistry LibreTexts

Introduction

In our previous article, we calculated the number of moles of carbon atoms in 50.0 g of CS2. In this article, we will address some frequently asked questions related to the calculation.

Q&A

Q: What is the molecular formula of CS2?

A: The molecular formula of CS2 is C-S-S, indicating that it consists of one carbon atom and two sulfur atoms.

Q: What is the atomic mass of carbon?

A: The atomic mass of carbon is 12.01 g/mol.

Q: What is the atomic mass of sulfur?

A: The atomic mass of sulfur is 32.07 g/mol.

Q: How do you calculate the molar mass of CS2?

A: The molar mass of CS2 can be calculated by adding the atomic masses of carbon and two sulfur atoms. The formula is: Molar mass of CS2 = Atomic mass of C + 2 x Atomic mass of S.

Q: How do you calculate the number of moles of CS2?

A: The number of moles of CS2 can be calculated using the formula: Number of moles = Mass of substance / Molar mass.

Q: What is the relationship between the number of moles of CS2 and the number of moles of carbon atoms?

A: Since the molecular formula of CS2 consists of one carbon atom, the number of moles of carbon atoms is equal to the number of moles of CS2.

Q: Can you provide an example of how to calculate the number of moles of carbon atoms in a different substance?

A: Let's say we want to calculate the number of moles of carbon atoms in 25.0 g of CO2. The molecular formula of CO2 is C-O-O, indicating that it consists of one carbon atom and two oxygen atoms. The atomic mass of carbon is 12.01 g/mol, and the atomic mass of oxygen is 16.00 g/mol. The molar mass of CO2 can be calculated as: Molar mass of CO2 = Atomic mass of C + 2 x Atomic mass of O = 12.01 g/mol + 2 x 16.00 g/mol = 44.01 g/mol. The number of moles of CO2 can be calculated as: Number of moles = Mass of substance / Molar mass = 25.0 g / 44.01 g/mol = 0.568 mol. Since the molecular formula of CO2 consists of one carbon atom, the number of moles of carbon atoms is equal to the number of moles of CO2.

Q: What are some common mistakes to avoid when calculating the number of moles of atoms in a substance?

*A: Some common mistakes to avoid include:

Not using the correct atomic masses of the elements
Not using the correct molecular formula of the substance
Not calculating the molar mass of the substance correctly
Not using the correct formula to calculate the number of moles of the substance*