Understanding the Molar Mass of Hydrogen Peroxide

Oct 13, 2025 by wbrum.org 80 views

Understanding the Molar Mass of Hydrogen Peroxide

Hydrogen peroxide, denoted by the chemical formula $\left( H_2O_2 \right)$ , is a compound composed of two hydrogen atoms and two oxygen atoms. To determine the mass of 7.00 mol of hydrogen peroxide, we first need to calculate its molar mass. The molar mass of a substance is the sum of the atomic masses of its constituent atoms.

Calculating the Molar Mass of Hydrogen Peroxide

The atomic mass of hydrogen (H) is approximately 1.008 g/mol, and the atomic mass of oxygen (O) is approximately 16.00 g/mol. Since hydrogen peroxide consists of two hydrogen atoms and two oxygen atoms, its molar mass can be calculated as follows:

Molar mass of $\left( H_2O_2 \right)$ = (2 * atomic mass of H) + (2 * atomic mass of O) = (2 * 1.008 g/mol) + (2 * 16.00 g/mol) = 2.016 g/mol + 32.00 g/mol = 34.016 g/mol

Determining the Mass of 7.00 Mol of Hydrogen Peroxide

Now that we have the molar mass of hydrogen peroxide, we can calculate the mass of 7.00 mol of the substance by multiplying the molar mass by the number of moles:

Mass of 7.00 mol of $\left( H_2O_2 \right)$ = molar mass of $\left( H_2O_2 \right)$ * number of moles = 34.016 g/mol * 7.00 mol = 238.112 g

Rounding this value to three significant figures, we get a mass of approximately 238 g.

Conclusion

Based on the calculation, the mass of 7.00 mol of hydrogen peroxide is approximately 238 g. This value is consistent with option D in the given choices.

Key Takeaways

The molar mass of hydrogen peroxide is 34.016 g/mol.
The mass of 7.00 mol of hydrogen peroxide can be calculated by multiplying the molar mass by the number of moles.
The mass of 7.00 mol of hydrogen peroxide is approximately 238 g.

Frequently Asked Questions

What is the molar mass of hydrogen peroxide? The molar mass of hydrogen peroxide is 34.016 g/mol.
How do I calculate the mass of a substance given its molar mass and number of moles? To calculate the mass of a substance, multiply its molar mass by the number of moles.
What is the mass of 7.00 mol of hydrogen peroxide? The mass of 7.00 mol of hydrogen peroxide is approximately 238 g.

Understanding the Basics of Molar Mass and Hydrogen Peroxide

In our previous article, we explored the concept of molar mass and its application in calculating the mass of a substance. We also calculated the mass of 7.00 mol of hydrogen peroxide, which is a common compound used in various applications. In this article, we will address some frequently asked questions related to hydrogen peroxide and molar mass.

Q&A: Hydrogen Peroxide and Molar Mass

Q: What is the molar mass of hydrogen peroxide?

A: The molar mass of hydrogen peroxide is 34.016 g/mol.

Q: How do I calculate the mass of a substance given its molar mass and number of moles?

A: To calculate the mass of a substance, multiply its molar mass by the number of moles. The formula is: Mass = Molar mass * Number of moles.

Q: What is the mass of 7.00 mol of hydrogen peroxide?

A: The mass of 7.00 mol of hydrogen peroxide is approximately 238 g.

Q: How do I determine the number of moles of a substance given its mass and molar mass?

A: To determine the number of moles of a substance, divide its mass by its molar mass. The formula is: Number of moles = Mass / Molar mass.

Q: What is the difference between the molar mass of hydrogen peroxide and its molecular weight?

A: The molar mass of a substance is the sum of the atomic masses of its constituent atoms, while its molecular weight is the sum of the atomic weights of its constituent atoms. In the case of hydrogen peroxide, the molar mass is 34.016 g/mol, while its molecular weight is 34.014 g/mol.

Q: Can I use the molecular weight of a substance instead of its molar mass in calculations?

A: While the molecular weight of a substance is similar to its molar mass, it is not exactly the same. The molecular weight is typically used in calculations involving the molecular formula of a substance, while the molar mass is used in calculations involving the number of moles of a substance.

Q: What are some common applications of hydrogen peroxide?

A: Hydrogen peroxide is commonly used as a disinfectant, a bleaching agent, and a rocket fuel. It is also used in the production of paper, textiles, and other materials.

Conclusion

In this article, we have addressed some frequently asked questions related to hydrogen peroxide and molar mass. We have provided explanations and formulas for calculating the mass of a substance given its molar mass and number of moles, as well as determining the number of moles of a substance given its mass and molar mass. We have also discussed the difference between the molar mass and molecular weight of a substance, and provided information on some common applications of hydrogen peroxide.

Key Takeaways

The molar mass of hydrogen peroxide is 34.016 g/mol.
The mass of 7.00 mol of hydrogen peroxide is approximately 238 g.
To calculate the mass of a substance, multiply its molar mass by the number of moles.
To determine the number of moles of a substance, divide its mass by its molar mass.
The molecular weight of a substance is similar to its molar mass, but not exactly the same.

Frequently Asked Questions

What is the molar mass of hydrogen peroxide? The molar mass of hydrogen peroxide is 34.016 g/mol.
How do I calculate the mass of a substance given its molar mass and number of moles? To calculate the mass of a substance, multiply its molar mass by the number of moles.
What is the mass of 7.00 mol of hydrogen peroxide? The mass of 7.00 mol of hydrogen peroxide is approximately 238 g.
How do I determine the number of moles of a substance given its mass and molar mass? To determine the number of moles of a substance, divide its mass by its molar mass.