Question

0.25 mole of C has the same number of atoms as 0.25 mole of Hg.

Answer 1

yes, a mole is a number just like a dozen is 12, a mole is \(6.022*10^{23}\).

Answer 2

it's how its figured out due to the process of computation and which way you are going are you going from grams to moles or atoms to moles. it could change drastically when you have grams to moles but they also can be similar depending on how many grams you have and how many grams of molar mass you are dividing by.