A $45$ ton tank car contains liquid chlorine gas $($Cl$2)$ under pressure. A leak develops and the car loses $1$ kg of gas per minute. What is the rate at which energy needs to be withdrawn from the environment to sustain this leakage. The enthalpy of vaporization of chlorine gas at room temperature is $20\mathrm{.}4$ kJ$/$mole$.$ Why would insulating the car be beneficial to reduce the duration of leakage?