Which of these best orders the rock layers from the youngest to the oldest? (1 point)
1) layer a - layer b - layer c → layer d
2) layer a - layer d - layer b - layer c
3) layer d - layer c - layer b - layer a
layer d - layer a - layer c → layer b

Nacidified solution was electrolyzed using copper electrodes. a constant current of 1.18 a caused the anode to lose 0.584 g after 1.52 ✕ 103 s. given that the charge of an electron is 1.6022 ✕ 10−19 c, calculate avogadro's number. assume that copper is oxidized to cu2+ ions.