A blacksmith cools a $2\mathrm{.}00$ kg chunk of iron, initially at a temperature of $650\mathrm{.}\mathrm{⁰}$C$,$ by trickling $15\mathrm{.}0$C water over it$.$ All the water boils away, and the iron ends up at a temperature of $120\mathrm{.}\mathrm{⁰}$C$.$

 

 $\mathrm{}$How much water did the blacksmith trickle over the iron?