When it comes to finding the mass of 3.00 moles of NO2, it can be a bit tricky to figure out. The key to finding the answer is understanding the concept of the mole and how it relates to atoms, molecules, and molar mass.

## What Is a Mole?

A mole is simply a unit of measurement, and it represents the number of atoms, molecules, or particles found in a certain mass. A mole is typically equal to 6.022 x 10^23 of any kind of particle. This is also known as Avogadro’s number.

## What Is Molar Mass?

Molar mass is the mass of one mole of any given substance. This is typically expressed in grams per mole, and it is calculated by taking the atomic mass of each atom and multiplying it by the number of atoms in a molecule of that element. For example, the molar mass of water would be calculated by taking the mass of two hydrogen atoms (1.00794 g/mol) and one oxygen atom (15.9994 g/mol) and multiplying them together (18.015 g/mol).

## Calculating the Mass of 3.00 Moles of NO2

Now that you understand the concepts of moles and molar mass, it’s time to calculate the answer! NO2 (or nitrogen dioxide) is composed of two nitrogen atoms and two oxygen atoms. To calculate the molar mass of NO2, you need to find the atomic mass of each atom and multiply it by the number of atoms. For nitrogen, the atomic mass is 14.0067 g/mol, and for oxygen it is 15.9994 g/mol. Multiplying these two together gives you a molar mass of 46.0051 g/mol.

Now that you know the molar mass of NO2, it’s time to calculate the mass of 3.00 moles. The equation to use is mass (g) = moles × molar mass. Plugging in the numbers, you get: 3.00 moles × 46.0051 g/mol = 138.01 g. Therefore, 3.00 moles of NO2 have a mass of 138.01 grams.

## Conclusion

Calculating the mass of 3.00 moles of NO2 is a simple task once you understand the concepts of moles and molar mass. You simply need to multiply the number of moles by the molar mass of NO2, which is 46.0051 g/mol. This gives you the answer of 138.01 grams for the mass of 3.00 moles of NO2.