Question

How many moles is 2.80 X 10^24 atoms of silicon?

Answer 1

Let x moles of silicon contains 2.8x10^24 atoms. 6.02x10^23 atoms are present in 1 mole of Si. Therefore 2.80x10^24 atoms are present in = 2.8x10^24/6.02x10^23 = 4.65 moles of Si.

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Answer 2

$2.80× 10^24$ atoms of silicon have 0.2 moles.

Given: $2.80× 10^24$ atoms of silicon.

To find: We have to find the number of moles.

Solution:

Silicon has atomic number 14.

One mole of silicon contains $6.023× 10^23$ number of atoms.

$6.023× 10^23$ number of atoms are present in one mole of silicon.

$2.80× 10^24$ number of atoms will have-

$\dfrac{6.023× 10^23} {2.80× 10^24}=0.2$ moles.

Thus $2.80× 10^24$ atoms of silicon have 0.2 moles.