How many moles are there in 4.20 g of SO2?

To find the number of moles in a given mass of a substance, you can use the formula:

Number of moles = Mass of the substance (g) / Molar mass of the substance (g/mol)

First, you need to calculate the molar mass of SO2 (sulfur dioxide). The molar mass is the sum of the atomic masses of all the atoms in a molecule:

- Sulfur (S) has an atomic mass of approximately 32.07 g/mol. - Oxygen (O) has an atomic mass of approximately 16.00 g/mol.

Since there are two oxygen atoms in SO2, you would multiply the atomic mass of oxygen by 2:

Molar mass of SO2 = (1 x 32.07 g/mol) + (2 x 16.00 g/mol) Molar mass of SO2 = 32.07 g/mol + 32.00 g/mol Molar mass of SO2 = 64.07 g/mol

Now you can calculate the number of moles in 4.20 g of SO2:

Number of moles = Mass of SO2 / Molar mass of SO2 Number of moles = 4.20 g / 64.07 g/mol Number of moles = 0.06556 mol (rounded to five decimal places)

Therefore, there are approximately 0.06556 moles in 4.20 g of SO2.