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What is the mass of 1 mol of atoms for an element?

It is equal to the mass of 6.022×1023 of atoms of oxygen, i. e. about 16 g.
It is equal to the mass of 6.022×1023 of atoms of carbon, i. e. about 12 g.
It is strongly depend on the conditions of the measurement.
It is equal to the molar mass of the element.

 

 

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