How many molecules are in a 2.1 mol of H2O? *

The mole is the SI unit for amount of a substance.

Explanation:

Just like the dozen and the gross, it is a name that stands for a number. There are therefore 6.02 × 10 23 water molecules in a mole of water molecules.

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons

im pretty sure its b