To treat a burn on his hand, a person decides to place an ice cube on the burned skin. The mass of the ice cube is 12.0 g, and its initial temperature is -14.0 °C. The water resulting from the melted ice reaches the temperature of his skin, 29.1 °C. How much heat is absorbed by the ice cube and resulting water? Assume that all of the water remains in the hand. Constants for water can be found in this table. q= Quantity Enthalpy of fusion at 0°C Enthalpy of vaporization at 100°C Specific heat of solid H₂O (ice) Specific heat of liquid H₂O (water) Specific heat of gaseous H₂O (steam) per gram 333.6 J/g 2257 J/g 2.087 J/(g.°C) * 4.184 J/(g.°C) * 2.000 J/(g.°C) * per mole 6010. J/mol 40660 J/mol 37.60 J/(mol.°C) * 75.37 J/(mol.°C) * 36.03 J/(mol.°C) *

Q: 17. An ice cube is placed in a sealed insulated container of hot water at 80°C. After five minutes,…

A: The heat flow always occurs from high temperature to low temperature until equilibrium.

Q: A 500-g piece of metal (a steel) is dropped into 775 mL of water at 23.5 °C. The final temperature…

A:

Q: How much heat (in Joules) is gained by 447 grams of water that is warmed from 25.0 J °C to 54.0°C?…

A: The amount of heat absorbed (or released) by fixed amount of a substance to change its temperature…

Q: A hot 105.0 g lump of an unknown substance initially at 152.2 °C is placed in 35.0 mL of water…

A:

Q: In a calorimetric analysis, 2.42 g of potassium chloride is weighed. The heat of solution of this…

A:

Q: A piece of metal with a specific heat of 1.09 J/gºC is heated to 108ºC and then placed in 139.785 g…

A: Given that: Mass of water = 139.785 gInitial temperature of water = 1.7oCFinal temperate of water…

Q: When you mix two substances, the heat gained by one substance is equal to the heat lost by the other…

A: According to the specific heat equation : q = m. C. ∆ T Where  q = heat absorbed or released m =…

Q: a. The methanol in an automobile engine must be in the gas phase before it can react. Calculate the…

A:

Q: A cold pack contains 134.4 g of water and 40.7 g of ammonium nitrate. What will be the final…

A: The formula which is used in the solution is shown below. Q = mcΔT ⇒ ΔT = Q/mc

Q: A chemist carefully measures the amount of heat needed to raise the temperature of a 794.0 g sample…

A:

Q: 12. When freezing weather threatens the citrus crop in Florida, growers spray their orange trees…

A:

Q: A material has a specific heat of 0.625 J/g°C.  A 75.6 g sample of this material is heated  and them…

A:

Q: What is heat? How does heat differ from thermal energy? Under what condition is heat transferred…

A: Heat: Heat is a form of energy that is transferred from one body to another because of difference in…

Thermochemistry

Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.    

Exergonic Reaction

The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.