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Question

A computer chip contains 1.20×1023 atoms of silicon. What mass will it have?

A
6.02 x 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
1 mole of Si is equal to 6.02×1023 atoms.
1.20×1023 atoms of Si correspond to 1.20×10236.02×1023=0.199 moles.
The atomic mass of Si is 28.1 g/mol.
The mass of Si is 28.1g/mol×0.199=5.6 grams.

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