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Atomic Mass and Atomic Mass Unit

A silicon chi...

Question

A silicon chip used in an integrated circuit of a microcomputer has a mass of 5.68mg . How many silicon (Si) atoms are present in this chip

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Solution

Mass of silicon, 5.68mg=5.68×10^−3g
Number of Si atoms =NA× g-atom
=6.023×10^23×5.68×(10^−3)/28
=1.22×10^20 atoms

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