In an electrolysis experiment electric current was passed for 5hr through two cells connected in series.The first cell contains gold salt and second contains $CuSO_4$ solution.9.83g of gold was deposited in first cell.If the oxidation number of Au is +3,find the amount of copper deposited in second cell

Question

$\begin{array}{1 1}(a)\;4g&(b)\;5g\\(c)\;4.7g&(d)\;5.7g\end{array}$