How many molecules are in 15.6 g NO2?
Answer in units of molecules
How many mols. mols NO2 = grams/molar mass = ?
Then 1 mol contains 6.02E23 molecules; therefore, ? mols will contain ..... molecules.
To calculate the number of molecules in a given mass of a substance, you need to use the concept of molar mass and Avogadro's number.
1. Find the molar mass of NO2:
The molar mass of nitrogen (N) is approximately 14.01 g/mol, and the molar mass of oxygen (O) is approximately 16.00 g/mol. NO2 consists of one nitrogen atom and two oxygen atoms, so you need to add the molar masses of nitrogen and oxygen together:
Molar mass of NO2 = (1 * molar mass of N) + (2 * molar mass of O)
Molar mass of NO2 = (1 * 14.01 g/mol) + (2 * 16.00 g/mol)
Molar mass of NO2 = 46.01 g/mol
2. Calculate the number of moles of NO2:
To convert the given mass of NO2 to moles, use the formula:
Number of moles = Mass / Molar mass
Number of moles of NO2 = 15.6 g / 46.01 g/mol
Number of moles of NO2 ≈ 0.338 moles
3. Use Avogadro's number to convert moles to molecules:
Avogadro's number, denoted as "N_A," is approximately 6.022 x 10^23 molecules/mol. Multiply the number of moles by Avogadro's number to obtain the number of molecules:
Number of molecules = Number of moles * Avogadro's number
Number of molecules = 0.338 moles * (6.022 x 10^23 molecules/mol)
Number of molecules ≈ 2.037 x 10^23 molecules
Therefore, there are approximately 2.037 x 10^23 molecules in 15.6 g of NO2.