The mole is a very commonly used unit of measurement of a substance. By convention, a mole of a substance contains 6.023 x 10^23 atoms or molecules of the substance. In other words, 1 mole of an element will contain 6.023 x 10^23 atoms of that element, while 1 mole of a compound will contain 6.023 x 10^23 molecules of that compound. The number "6.023 x 10^23" is also known as Avogadro's number.
In this case, we have to find the number of atoms in 4 moles of silicon, which is an element. Since 1 mole of silicon contains 6.023 x 10^23 atoms, 4 moles will contain:
(4 moles) x (6.023 x 10^23 atoms) = 2.4092 x 10^24 atoms.
Thus, 4 moles of the silicon element contains about 2.4 x 10^24 atoms.
Hope this helps.
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