42. ••• In an experiment, a 0.150-kg piece of a ceramic material at 20 °C is placed in liquid nitrogen at its boiling point to cool in a perfectly insulated flask, which allows the gaseous N2 to immediately escape. How many liters of liquid nitrogen will be boiled away during this operation?

(Take the specific heat of the material to be that of glass and the liquid nitrogen density as 8.0 × 102 kg/m3.)