1. Determine the amount of heat abs orbed when 35.77 grams of O2 are produced according to the equation. CO2(9) → C (diamond) + O2(g) AH = 395.4 kJ
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.
![Determine the amount of heat (In RJ) given off per 65.3g of NH3
used.
mol
Solution:
Given:
mass of NH3
= 65.3 g
-904 kJ
Conversion factor:
i mol NH3
hea
Unknown:
Computation:
Heat evolved = 65.3 NH
GENERAL CHEMISTRY 2 | U
You
Ariana Lher+31
ACTIVITY
Directions: Solve the following word problems.
1. Determine the amount of heat abs orbed when 35.77 grams of O2 are produced according to
the equation.
CO2 (g) → C (diamond) +
O2(g)
AH = 395.4 kJ
2. Octane, a major component of gasoline, burns according to the reaction:
16CO16(9) + 18H2O(g)
2C8H1 8(0) + 2502(g) →
AH = -1.10 x 104 kJ
SELF - ASSESSMENT
Directions: Solve the following word problems.
1. Methanol undergoes combustion according to the equation:
302(g) >
2CH3OH0)
2CO2(9) +
4 H2O(1)
AH = -1 452.8 kJ
+
Find the amount of heat given off from the combustion of 323.2 g CH3OH.
2. Calculate the heat evolved when 266 g of white phosphorus (P4) burns in air according to the
equation:
P4(s)
502(9)
P4O10(s)
AH = -3013 kJ/mol
+
3. Given the thermochemical equation
2SO29) + O2 (9) → 2SO3(9)
AH = -198.2 kJ/mol
calculate the heat evolved when 87.9 g of SO2 (molar mass = 64.07 g/mol) is converted to SO3.
Page |4
GENERAL CHEMISTRY 2 | UMAK- HSU-MATHEMATICS, SCIENCE & RESEARCH DEPARTMENT
ASSIGNMENT
Directions: Solve the given problem below.
1. Nitrogen and oxygen gas combine to form nitrogen dioxide according to the following reaction:
N2(g)
202(g)
2NO2(g)
+
Calculate the change in enthalpy for this reaction using the following reactions:
N2 (g)
Oz(g)
2NO(g)
AHO rxn = 181 kJ
2NO9)
+ O2(g)
2NO2(9)
AH° rxn = -113KJ](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F462d8638-e1d3-45af-af95-206b4c01656d%2Ff595edb3-8ece-4030-af53-d2af708ed4e0%2Fss5qk4_processed.jpeg&w=3840&q=75)
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