Chemistry Questions

First question: How we can find Avogadro number if we know density of Aluminum 2.7 g/mL One mole of Al 26.98 g radius of Al atom 143 picometers.. (1x10^-12) Spherical density 74% (theoretical) Cubic density 54 % (theoretical) Second question: We need to find with of aluminum foil in atoms (how many atoms we can stack on each other to equal the with of aluminum foil Given aluminum foil 744,5 cm^2 mass of foil 2.60 g One mole of Al 26.98 g density 2.7 g/mL radius of 1 atom of Al 143 пикометров.. (1x10^-12) Spherical density of Al 74% (theoretical) Cubic density of Al 54 % (theoretical)