How many atoms are in 2.8 moles of silicon?

Answer 1

1,685,600,000,000,000,000,000,000 or 1.6856 septillion or 1.6856*10^24 atoms.

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Each mole would have 6.023 x 1023 atoms in it

So for 2.8 moles simply multiply the above by 2.8. You would get it easily

Answer 2

There are 1.69 x 10^24 atoms in 2.8 moles of silicon. This can be calculated by multiplying Avogadro's number (6.022 x 10^23 atoms/mole) by the number of moles given.