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Answer:
0.296×10²⁷ moles of Mg atoms.
Explanation:
Given data:
Number of moles of Mg = ?
Number of atoms = 1.78 ×10⁵⁰ atom
Solution:
Avogadro number:
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
For example,
18 g of water = 1 mole = 6.022 × 10²³ molecules of water
1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen
Number of moles of Mg atoms:
1.78 ×10⁵⁰ atom × 1 mol /6.022 × 10²³ atoms
0.296×10²⁷ moles of Mg atoms.