The average mass of one atom of krypton (Kr) can be calculated using its molar mass. The molar mass of krypton is given as 83.80 g/mol. This means that one mole of krypton, which contains approximately 6.022 x 1023 atoms (Avogadro’s number), has a mass of 83.80 grams.
To find the mass of a single atom of krypton, you divide the molar mass by Avogadro’s number:
Average mass of one krypton atom = Molar mass / Avogadro’s number
Average mass of one krypton atom = 83.80 g/mol / (6.022 x 1023 atoms/mol)
This calculation yields:
Average mass of one krypton atom ≈ 1.39 x 10-25 grams
Thus, the average mass of one atom of krypton is approximately 1.39 x 10-25 grams.