The mass of a given number of atoms can be calculated using the atomic mass unit (amu) or the molar mass of the element.
The atomic mass of cobalt (Co) is approximately 58.93 amu. This means that one mole of cobalt atoms has a mass of 58.93 grams.
To find the mass of 3.01×10^21 atoms of cobalt, you can follow these steps:
Convert the given number of atoms to moles: Moles of cobalt atoms = (3.01×10^21 atoms) / (6.022×10^23 atoms/mol) ≈ 0.004995 mol (approximately 0.005 mol)
Calculate the mass using the molar mass: Mass of cobalt = Moles of cobalt × Molar mass = 0.005 mol × 58.93 g/mol ≈ 0.295 g (approximately 0.3 g)
Therefore, the mass of 3.01×10^21 atoms of cobalt is approximately 0.3 grams.