A 685 mL sample of Hg(l) at 20 °C is added to a large quantity of liquid N₂ kept at its boiling point in a thermally insulated container. What mass of N₂(l) is vaporized as the Hg is brought to the temperature of the liquid N₂? For the specific heat of Hg(l) from 20 to -39 °C use 0.138 J g^-1 °C^-1 and for Hg(s) from -39 to -196 °C, 0.126 J g^-1 °C^-1. The density of Hg(l) is 13.6 g/mL, its melting point is -39 °C, and its enthalpy of fusion is 2.30 kJ mol^-1. The boiling point of N₂(l) is -196 °C, and its Δ_vapH is 5.58 kJ mol^-1.