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How many atoms of silicon are in 0.75 mol of disilicon hexahydride, Si2H6? A.4.5x 1023 atoms B.6.02 x 1023 atoms C.8.0 x 1023 atoms D.9.0x1023 atoms

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Answer:

D. 9.0x10²³ atoms

Explanation:

First we use Avogadro's number to calculate how many molecules of Si₂H₆ are there in 0.75 mol:

  • 0.75 mol * 6.023x10²³ molecules/mol = 4.52x10²³ molecules

There are 2 Si atoms in one Si₂H₆ molecule, that means that in 4.52x10²³ Si₂H₆ molecules there will be:

  • 2 * 4.52x10²³ = 9.03x10²³ Si atoms

Thus the answer is option D.

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