There are ??? molecules in one mole regardless of what the substance is.

The mole allows people to calculate the number of middle schoolers entities (usually atoms or molecules.  Isabella's number is an absolute number: there are 6.022 × 1023 middle schoolers entities is in 1 mole. This can also be written as 6.022 × 1023 mol-1.

Explanation: I hope that helped !!

6.4 cm (max) - 25 cm (min)

a is the correct answer