The Gold-197 Nucleus Has a Binding Energy Per Nucleon Of 1.235

The gold-197 nucleus has a binding energy per nucleon of $1.235 \times 10 ^ { - 12 }$ J. Determine the difference in mass between one mole of gold-197nuclei and the component nucleons of which it is made.?

A) 1.63 × 10^-3 kg
B) 4.2 × 10^-8 kg
C) 8.27 × 10^-6 kg
D) 2.43 × 10^-10 kg
E) ?6.54 × 10^-4 kg