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Question

What is the mass of a computer chip containing 1.20×1023 atoms of silicon?

A
6.02×1023 grams
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B
5.6 grams
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C
28 grams
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D
14 grams
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E
2 grams
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Solution

The correct option is B 5.6 grams
One mole of silicon =28g (atomic mass of silicon)
Now, number of atoms in one mole (or 28g) of silicon =6.02×1023, or we can say 6.02×1023 atoms are present in 28g
Therefore, 1.20×1023 atoms will be present in =28×1.20×1023/6.02×1023=5.6g

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