Electrochemistry: describe question

A student determines the Avogadro constant, $L$, using a silver coulometer. Two clean silver electrodes are placed in an aqueous solution of silver nitrate, $\ce{AgNO3}$. A steady current of $0.50\,\text{A}$ is passed for exactly $30.0\,\text{min}$. The cathode gains $1.00\,\text{g}$ in mass. The charge on the electron is $1.60 \times 10^{-19}\,\text{C}$, and the relative atomic mass of silver is $108$.

Describe how the student would determine a value for $L$ from these measurements.