The correct measurement is:
1 mole of Nb = 92.906 grams.
This is because the atomic mass of an element in atomic mass units (amu) corresponds to the mass of one mole of that element in grams. Therefore, 1 mole of niobium, with an atomic mass of 92.906 amu, has a mass of 92.906 grams.
The other statements are incorrect. Here’s a brief clarification for each:
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1 gram of Nb = 92.906 moles: This is incorrect; 1 gram of Nb would be far less than 1 mole.
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1 gram of Nb = 92.906 atoms: This is also incorrect; atoms are measured in moles, not in grams directly.
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1 mole of Nb = 92.906 atoms: This is incorrect too; 1 mole of any substance contains approximately \(6.022 \times 10^{23}\) atoms, not 92.906.
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