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How does the number of atoms in a 27.5-gram zinc ring compare to the number in...

How does the number of atoms in a 27.5-gram zinc ring compare to the number in a chrome ring of the same mass?

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Answer #1

Calculate the number of moles of chrome-

m = W/mcr = 27.5 / 52 = 0.5288

Calculate the number of atoms in Crome-

n = mNA

n = 0.5288*6.023*1023 = 3.1849*1023 atoms

Hence the number of atoms in Crome is 3.1849*1023 atoms.

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