$4\mathrm{.}75$ An evacuated rigid tank of $0\mathrm{.}03m^3$ volume is connected to a steam line at $1\mathrm{.}8$MPa and $300C.$ The valve between the steam line and the tank is opened and steam is allowed to enter the tank. If the temperature of the tank contents remains constant at $300C,$ calculate the amount of heat transferred when the flow of steam into the tank finally stops.

$($Answer: $-54$kJ$)$