Question 3 given that au-197 is the only natural isotope of gold, what is the mass of one au atom and the mass of avogadro's number of au atoms, respectively? 196.97 g and 196.97 amu 197 amu and 197 g 197 g and 197 amu 196.97 amu and 196.97 g none of the above

Explanation:

The mass number of an element is a weighted average of all the isotopes of that element.

If Au has only one isotope then the atomic weight of that isotope matches the mass number.

Au-197 ==> mass number 197

Mass of one atom=mass number 197 amu

Mass of one mol of atoms:

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