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Which one of the following statements is...

Which one of the following statements is incorrect?
(1) One gram atom of carbon contains Avogadro number of atoms
(2) One mole of oxygen gas contains Avogadro number of molecules
(3) One mole of hydrogen gas contains Avogadro number of atoms
(4) One mole of electrons will weigh nearly 0.547mg `(mass of e^(-) = 9.1 * 10^(-28)g)`

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