18) Ethyl chloride, C2H5C1, is used as a local anesthetic. It works by cooling tissue as it vaporizes; its heat of vaporization is 26.4 kJ/mol. How much heat could be removed by 20.0 g of ethyl chloride? B) 3410 kJ C) 341 kJ D) 528 kJ A) 8.18 kJ

Calculate how much energy it will take to heat 100 g of water from -20.0°C to 120°C. Given: ice = 2.03 J/g°C; liquid = 4.184 J/g°C; vapor = 1.99 J/g°C; ΔHfus= 6.01 kJ/mol; ΔHvap= 40.79 kJ/mol; Hfus= 6.01 kJ/mol Remember that water has a typical fp of 0.0°C and a bp of 100.0°C. (answer = 4730 kJ)

20.) You want to raise the temperature of ice at 0 degrees Celsius to steam at 110 degrees O Celsius. The specific heat of water is 4.184 J/Cg. The specific heat of steam is 2.01 J/Cg, and the specific heat of ice is 2.03 J/Cg. Ice has a heat of fusion at 334 J/g and water has a heat of vaporization of 2260 J/g. Find the Q for this raise in temperature.

Determine the heat of dissolution, in kJ/mol, of 0.250 mol C2 having a specific heat of 0.82 J/g °C. A 9 g sample of C2 was placed in calorimeter with water weighing 130 g. The initial temperature of the system was 18.6 °C and was allowed to reach thermal equilibrium at a temperature of 23.1 °C. Assume that the calorimeter is a perfect insulator. Report answer with 3 significant figures.

Calculate the amount of heat needed to raise the temperature of 55.0 g of liquid water from 25°C to 99°C. The specific heat of liquid water is 1.00 cal/g °C

Calculate the energy (in kcal) required to convert one ice cube that was made by freezing 72 mL of water (density = 1.000 g/L) an an initial temperature of -36.0 C, to liquid water at a final temperature of 37.0 CH2O(s) --> H2O(l) ΔH = +6.02 kj/mol Cpm H2O(s) = 37.7 J/mol x K  Cpm H2O(l) = 75.4 J/mol x K  1 kcal = 4.18 kJ

The enthalpy for boiling water is 40.7 kJ/mol. How much heat (in kJ) is required to boil 322.1 g of water?

Determine the heat of dissolution, in kJ/mol, of 0.250 mol C2 having a specific heat of 0.81 J/g °C. A 5 g sample of C2 was placed in calorimeter with water weighing 142 g. The initial temperature of the system was 18.5 °C and was allowed to reach thermal equilibrium at a temperature of 22.6 °C. Assume that the calorimeter is a perfect insulator. Report answer with 3 significant figures.

what is the final temp of an insulating polymer if a 69.30 g sample with specific heat of 8.315 J/g C initially at 28.3 C absorbed 4.0 kJ of heat?

How much heat is absorbed by a 275-gram sample of water as it is heated from 25oC to its boiling point, 100oC? The specific heat of water is 4.184 J/goC.