Understanding the Concept

* Moles and Avogadro's Number: The number of atoms in a sample is directly related to the number of moles. One mole of any substance contains 6.022 x 10^23 particles (Avogadro's number).

* Molar Mass: The molar mass is the mass of one mole of a substance. It's found on the periodic table.

Calculations

1. Find the number of moles:

* Magnesium (Mg): Molar mass = 24.31 g/mol

* Moles of Mg = 50 g / 24.31 g/mol ≈ 2.06 moles

* Lithium (Li): Molar mass = 6.94 g/mol

* Moles of Li = 50 g / 6.94 g/mol ≈ 7.21 moles

2. Calculate the number of atoms:

* Atoms of Mg = 2.06 moles * 6.022 x 10^23 atoms/mole ≈ 1.24 x 10^24 atoms

* Atoms of Li = 7.21 moles * 6.022 x 10^23 atoms/mole ≈ 4.34 x 10^24 atoms

Conclusion

50g of lithium has more atoms than 50g of magnesium.