For items 1-3, refer to the equation: CH4(9) + 202(9) → 2H2O1) + CO2(9), with AH equal to -809.94 kJ/mol. 1. Is the reaction heat-producing (exothermic) or heat-absorbing (endothermic)? 2. How many moles of liquid water (H2O1) will be produced upon combustion of 3 moles of methane gas (CH«9)? 3. Calculate the AH if 5g of methane gas was combusted. For the following items, choose the letter of the correct answer. Write it on your answer sheet in ALL UPPERCASE letters. 4. A process in which there is no thermal energy exchanged between a system and its surroundings is called alan: a. isothermal process c. diathermic process b. isobaric process d. adiabatic process 5. According to Hess' Law, the amount of energy expenditure for the same end-product will vary dependent on the number of steps. a. Statement above is true. b. Statement above is incorrect. c. Statement above is indeterminate. d. Statement above lacks varied data to make a judgement.
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.
For items 1-3, refer to the equation: CH4(g) + 2O2(g) → 2H2O(l) + CO2(g),
with ΔH equal to -809.94 kJ/mol.
1. Is the reaction heat-producing (exothermic) or heat-absorbing
(endothermic)?
2. How many moles of liquid water (H2O(l)) will be produced upon
combustion of 3 moles of methane gas (CH4(g))?
3. Calculate the ΔH if 5g of methane gas was combusted.
For the following items, choose the letter of the correct answer. Write it
on your answer sheet in ALL UPPERCASE letters.
4. A process in which there is no thermal energy exchanged between a
system and its surroundings is called a/an:
a. isothermal process b. isobaric process
c. diathermic process d. adiabatic process
5. According to Hess’ Law, the amount of energy expenditure for the same
end-product will vary dependent on the number of steps.
a. Statement above is true.
b. Statement above is incorrect.
c. Statement above is indeterminate.
d. Statement above lacks varied data to make a judgement.
Please answer all the questions.
Step by step
Solved in 5 steps
