A) water can be sterilized by boiling. How much heat is required to heat 4 gallons of water from room temperature 72F to 212F (1 g = 3.78 L) B) if the heat of vaporization of water is 40.7 kJ/mol how much heat is required to convert the original 4 gallons of water not at 212F to steam. Assume the density of water is 1g/mL at 72F
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.
A) water can be sterilized by boiling. How much heat is required to heat 4 gallons of water from room temperature 72F to 212F (1 g = 3.78 L)
B) if the heat of vaporization of water is 40.7 kJ/mol how much heat is required to convert the original 4 gallons of water not at 212F to steam. Assume the density of water is 1g/mL at 72F
Heat of Vaporization:
Heat of vaporization is the heat required to vaporize or evaporate to a certain amount of liquid to its gaseous form. It is represented by . It is expressed in
To calculate the heat required for any given amount of a substance the equation employed is-
Answer to Part A:
Given,
First, convert gallons of water to Litres and then to millilitres
Next, use density to find the mass of water
Convert given temperatures from Fahrenheit to Celsius and find the temperature difference
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