Answer
$0.091~J$ of heat left the mercury.
Work Step by Step
We can find the amount of heat that left the mercury:
$Q = m~c~\Delta T$
$Q = (0.10\times 10^{-3}~kg)(140~J/kg~C^{\circ})(-6.5~C^{\circ})$
$Q = -0.091~J$
$0.091~J$ of heat left the mercury.
