A 50.0 g piece of iron at 152 °C is dropped into 20.0 g H₂O(l) at 89 °C in an open, thermally insulated container. How much water would you expect to vaporize, assuming no water splashes out? The specific heats of iron and water are 0.45 and 4.21 J g^-1 °C^-1, respectively, and Δ_vapH = 40.7 kJ mol^-1H₂O.