CCl₂F2 is considered to be environmentally safe and is used as a refrigerant. The heat of vaporization of CCl₂F2 is 289 J/g. What mass of this substance must evaporate in order to freeze 2 moles of water initially at 20°C? The heat of fusion of water is 334 J/g and the specific heat of water is 4.18 J/g-K.

How much energy would need to be added to 930.g of ice at 0.0°C to turn it into liquid water at 0.0°C ? 930. J O 3.89x103 J O 1.86x103 J O 2.10x106 J 3.12x105 J

Calculate the total heat required to raise the temperature of 550 mL of H2O from 278 K to 298 K, and then to vaporize half the sample. Assume the density of H2O is 1 gmL-1, the specific heat of H2O is 4.18 J g-1K-1, and the enthalpy of vaporization is 44.0 kJ/mol

Two 20.0 g ice cubes at -14.0 °C are placed into 295 g of water at 25.0 °C. Assuming no energy is transferred to or from the surroundings, calculate the final temperature, Tf, of the water after all the ice melts. heat capacity of H₂O(s) heat capacity of H₂O(1) enthalpy of fusion of H₂O 37.7 J/(mol.K) 75.3 J/(mol.K) 6.01 kJ/mol Tf= °C

Two 20.0 g ice cubes at -18.0 °C are placed into 215 g of water at 25.0 °C. Assuming no energy is transferred to or from the surroundings, calculate the final temperature, Tf, of the water after all the ice melts. heat capacity of H₂O(s) heat capacity of H₂O(1) enthalpy of fusion of H₂O 37.7 J/(mol-K) 75.3 J/(mol-K) 6.01 kJ/mol Tf = °C

How many grams of ethanol, C2H5OH, can be boiled with 790.4 kJ of heat energy? The molar heat of vaporization of ethanol is 38.6 kJ/mol Mass of ethanol in grams

You pour 84 mL of 1.5 M HNO3 and 284 mL of 0.50 M KOH over 50 g ice. The solutions and the ice were both initially at 0C. How much ice melts? Assume the heat of neutralization is -57.3 kJ/mol.

Specific heat of H,O(s) 2.087 J/(g · °C) Specific heat of H,O(1) |4.184 J/ (g · °C) Heat of fusion for H,O A total of 865 cal of heat is added to 5.00 g of ice at -20.0 °C. 333.6 J/g What is the final temperature of the water? °C Tinal

How much heat (in kJ) is released in converting 1.00 mol of water as a gas at 105°C to ice at –5.0°C? The heat capacity of H2O (g) is 2.01 J/g · °C The heat capacity of H2O (l) is 4.18 J/g · °C The heat capacity of H2O (s) is 2.09 J/g · °C The heat of fusion for water at 0 °C is approximately 0.334 kJ/g The heat of vaporization for water at 100 °C is 2.230 kJ/g.

How much heat is required to convert 42.0 g of ethanol at −142 ∘C to the vapor phase at 78 ∘C?