Problem: A 67.2 g sample of a gold and palladium alloy contains 3.20×1023 atoms .What is the mass percentage of the gold in the alloy?

FREE Expert Solution

mass percent gold=mass goldmass alloy×100


Avogadro’s number = 6.022 x 1023 entities

                                      entities = atoms, ions, molecules, particles, formula units


If n = moles of Au then m = moles of Pd


mass alloy =67.2= n(196.97 gmolAu)+m(106.42gmolPd)total # of atoms =3.20×1023=n(6.022×1023 atoms Au)+m(6.022×1023 atoms Pd)

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Problem Details

A 67.2 g sample of a gold and palladium alloy contains 3.20×1023 atoms .

What is the mass percentage of the gold in the alloy?

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