To determine the number of electrons in a given mass of nitrogen atom, we need to use the concept of molar mass and Avogadro's number.
The molar mass of nitrogen (N₂) is approximately 28 grams per mole. This means that one mole of nitrogen atoms weighs 28 grams.
To find the number of moles in 0.28 grams of nitrogen, we can divide the given mass by the molar mass:
Number of moles = Mass (g) / Molar mass (g/mol) Number of moles = 0.28 g / 28 g/mol Number of moles = 0.01 mol
Now, since one mole of any substance contains Avogadro's number of particles (6.022 x 10^23), we can calculate the number of nitrogen atoms:
Number of nitrogen atoms = Number of moles x Avogadro's number Number of nitrogen atoms = 0.01 mol x 6.022 x 10^23/mol Number of nitrogen atoms = 6.022 x 10^21 nitrogen atoms
Therefore, there are approximately 6.022 x 10^21 electrons in 0.28 g of nitrogen atoms.