No. Of atoms in 12g of Mg is equal to
To determine the number of atoms in 12g of Mg (magnesium), you need to use the concept of mole.
1. Find the molar mass of magnesium (Mg). The atomic mass of magnesium is 24.31 g/mol.
2. Calculate the number of moles in 12g of Mg by dividing the given mass by the molar mass:
Number of moles = Mass (g) / Molar mass (g/mol)
= 12g / 24.31 g/mol
= 0.494 moles
3. One mole of any substance contains 6.022 × 10^23 atoms, which is known as Avogadro's number.
4. Convert the number of moles to the number of atoms by using Avogadro's number:
Number of atoms = Number of moles × Avogadro's number
= 0.494 moles × 6.022 × 10^23 atoms/mol
= 2.978 × 10^23 atoms
Therefore, there are approximately 2.978 × 10^23 atoms in 12g of magnesium.