0.222g of a divalent metal is deposited when a current of 0.45A is passed through a solution of its sent for 25mins. Calc the relative atomic mass of the metal (If accuracy =96500 coulombs)
an ampere (A) is a Coulomb (C) per second
total charge is ... 0.45 C/s * 25 min * 60 s/min = ? C
there are 9.65E4 C of charge in a mole of electrons
find moles of electrons ... total charge / 9.65E4 = ? moles
divalent means two moles of electrons per mole of metal
... so divide moles by two
divide grams of metal by moles of metal to find the molar mass
the molar mass (in grams) equals the atomic mass (in AMU)