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Question

A silicon chip used in an integrated circuit of computer has a mass of 5.68 mg. The number of Si atoms present in the chip are:

A
1.22×1020 atoms
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B
18×1020 atoms
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C
2.1×1020 atoms
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D
None of these
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Solution

The correct option is C 1.22×1020 atoms
Molar mass of silicon = 28 g = 28000 mg

28000 mg of silicon contain 6.022×1023 atoms

5.68 mg of silicon contain 6.022×102328000×5.68

=0.00122×1023

=1.22×1020 atoms

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