The 4.23 moles of NF3 are present in 2.55 * 1024 atoms. I.e option 2 is correct.
How to find the number of moles for any chemical compound?
The number of moles can find out by dividing the mass of that particular compound by its molar mass.
Given:
Total number of molecules = 2.55 * 1024
To calculate the number of moles = Given the number of atoms/Avogadro number
Avogadro number = 6.023 * 10 23
By using the formula, we get
2.55* 1024/ 6.023 * 10 23 = 4.23 moles
Hence, the answer is 4.23 moles
To learn more about moles and Avogadro numbers, check the link
brainly.com/question/1513182
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