Find the volume of a 9.0 M solution of hydrogen fluoride made from 82 moles of HF.

Ithink it's the third answer

The answer to your q it is d

Most elements have more than one naturally occurring isotope. as you learned previously, the atoms of those isotopes have the same atomic number (number of protons), making them belong to the same element, but they have different mass numbers (total number of protons and neutrons) giving them different atomic masses. so which mass is put on the periodic table for each element? is it the most common isotope’s mass? the heaviest mass? this activity will answer that question.

That would be d bud have you answer it yet