a sample of aluminum has a mass of 6.3g calculate the number of atoms of aluminum in the sample
To calculate the number of atoms in a sample of aluminum, we will use the concept of molar mass and Avogadro's number.
1. Find the molar mass of aluminum (Al) from the periodic table. The atomic mass of aluminum is 26.98 g/mol.
2. Convert the mass of the sample (6.3 g) to moles by dividing it by the molar mass:
moles = mass / molar mass
moles = 6.3 g / 26.98 g/mol
moles = 0.2332 mol
3. Use Avogadro's number (6.022 x 10^23 atoms/mol) to calculate the number of atoms in the sample:
number of atoms = moles * Avogadro's number
number of atoms = 0.2332 mol * 6.022 x 10^23 atoms/mol
number of atoms = 1.402 x 10^23 atoms
Therefore, there are approximately 1.402 x 10^23 atoms of aluminum in the sample.