21) Equal masses of ice at 0°C and water at 100°C are mixed in an insulated container. Give a good estimate of the final temperature of the mixture. Your answer 22) How much heat energy would be needed to raise the temperature of a 15.0 g sample of iron [C= 0.448 J/(g°C)] from 22.0°C to 100.0°C? Your answer 23) What is the heat change when a 53.5 g sample of water [Cwater = 4.184 J/(g°C)] is cooled from 98.0°C to 23.2°C? Your answer 24) A 5.00 g sample of a brownie was burned in a bomb calorimeter containing 2025 g of water. The temperature of the water increased from 23.50°C to 33.47°C. How much heat, in joules, did the brownie release when it burned? [Cwater = 4.184 J/(g°C)]
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.
SUBJECT : GENERAL CHEMISTRY 2
TOPIC : HEAT AND CALORIMETRY
NO NEED FOR SOLUTION JUST THE ANSWERS
![21) Equal masses of ice at 0°C and water at 100°C are mixed in an
insulated container. Give a good estimate of the final temperature of the
mixture.
Your answer
22) How much heat energy would be needed to raise the temperature of a
15.0 g sample of iron [C= 0.448 J/(g°C)] from 22.0°C to 100.0°C?
Your answer
23) What is the heat change when a 53.5 g sample of water [Cwater =
4.184 J/(g°C)] is cooled from 98.0°C to 23.2°C?
Your answer
24) A 5.00 g sample of a brownie was burned in a bomb calorimeter
containing 2025 g of water. The temperature of the water increased from
23.50°C to 33.47°C. How much heat, in joules, did the brownie release
when it burned? [Cwater = 4.184 J/(g°C)]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F9f3351c3-9657-43f5-a3ee-8e68522de4c1%2F95672719-1d50-4ef9-89a8-ec792b91701c%2Fgrg3tsc_processed.png&w=3840&q=75)
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