#### Answer

$ -1.92 \times 10^{-17}J$

#### Work Step by Step

We use the equation for the energy of the electron to find:
$w = vq$
Where v is the voltage and q is the charge. Substituting the charge of an electron for q and the given voltage for v, we obtain:
$w = 120 \times -1.6 \times 10^{-19}=-1.92 \times 10^{-17}J$
The electron goes from the negative to the positive, so the electron is going from lower to higher potential. Thus, it follows that $\underline{the \ electron \ gains \ energy.}$