Question

A mole is the amount of a substance that contains as many particles as the number of atoms in 12 grams of what isotope?

Answer 1

The `""^12C` isotope..................

Explanation:

By definition, `"Avogadro's number"`, often represented as `N_A`, `6.022140857(74)xx10^23 *mol^(−1)` is the number of carbon atoms present in `12*g` of `""^12C`.