Answer
$C=1.33\times10^{-5}F$.
Work Step by Step
$X_C=\frac{V}{I}=\frac{170V}{0.850A}=200\Omega$
Solve $X_C=\frac{1}{2 \pi fC}$ for the capacitance.
$C=\frac{1}{2 \pi fX_C}=\frac{1}{2 \pi (60.0Hz)( 200\Omega)}=1.33\times10^{-5}F$
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