Which has more mass Helium or mass

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.

Dao makes a table to identify the variables used in the equations for centripetal acceleration. what quantities belong in cells x and y?

The solid that is formed and usually sinks to the bottom of a solution is the