$($a$)$ How much heat flows from $1\mathrm{.}00$ kg of water at $45\mathrm{.}2$C when it is placed in contact with $1\mathrm{.}00$ kg of $17$C water in reaching equilibrium?

J

$($b$)$ What is the change in entropy due to this heat transfer?

J$/$K

$($c$)$ How much work is made unavailable, taking the lowest temperature to be $17$C$?$

J