One gm metal M³⁺ was discharged by the passage of 1.81 x 10²³ electrons. what is the atomic weight of metal?

When 1 mole of e^- passed, wt. of substance deposited
$=\frac{1\times 6.023\times {10}^{23}}{1.81\times {10}^{23}}\Rightarrow 3.34\mathrm{g}=\mathrm{eq}.\mathrm{wt}$
$\therefore$atomic wt. of metal =3.34 x 3 = 10.03 g