Please answer these chemistry questions

One mole of zinc has a mass of 65.4 grams. approximately how many atoms of zinc are present in one mole of zinc? 32 × 1023 atoms 6 × 1023 atoms 66 atoms 65 atoms

Rutherford's experiment indicated that matter was not as uniform as it appears what part of his experimental results implied this idea

What is avogadro’s number, and why is it useful