An ice cube weighing 18 g is removed from a freezer, where it has been at -20°C.
a. How much heat is required to warm it to 0°C without melting it?
b. How much additional heat is required to melt it to liquid water at 0°C?
c. Suppose the ice cube was placed initially in a 180 g sample of liquid water at +20°C in an insulated (thermally isolated) container. Describe the final state when the system has reached equilibrium.
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