Identify if the following processes are endothermic or exothermic and determine the phase transition: Liquid nitrogen is poured onto food to freeze it, and then quickly evaporates.

Calculate the final temperature of water when 5.00 g ice melts in 150 g of water initially at 8.00°C. All of heat required to melt ice comes from water.

Calculate the heat required in kJ for in the process of vaporizing 36.0 g of ethanol at 25°C to the vapor phase at 78°C. Write your answer using 2 significant figures

Date for ethanol: 

T_f = -114°C

T_b = 78°C

ΔH_fus = 5.02 kJ/mol

ΔH_vap = 38.56 kJ/mol

C_EtOH(s) = 0.97 J/g-K

C_EtOH(l)  = 2.3 J/g-K

C_EtOH(g)  = 2.03 J/g-K

Calculate the energy involved in kJ in the conversion of 503 g of steam at 373 K to ice at 254 K

C_H2O(s) = 2.06 J/g.°C

C_H2O(l)  = 4.18 J/g.°C

C_H2O(g)  = 2.03 J/g.°C

ΔH_vap = 40.6 kJ/mol

ΔH_fus = 6.02 kJ/mol