i) In a physics lab, a student accidentally fall a brass washer of 27.0 g into an open Dewar of liquid nitrogen at 77.2 K. Determine how much liquid nitrogen boils away as the washer cools from 297 K to 77.2 K? The latent heat of vaporization for the nitrogen is around 199.1 kJ/kg.
ii) Determine what mass of water at 28.0° C added to the Styrofoam cup having two ice cubes of 60.0 g from a freezer at -20.0° C will outcome in a final temperature of 5.0° C for the drink?
iii) Ice at 0.0° C is mixed with 4.00 x 102 ml of water at 21.0° C. Determine how much ice should melt to lower the water temperature to 0.0° C?