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.
![nd Mastering
Nitrogen dioxide reacts with water to produce
oxygen and ammonia:
You r
4NO2(g) + 6H2O(g) → 702(g) + 4NH3(g)
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![II Review I Constants I Periodic Table
You may want to reference (Pages 294 - 298) Section 8.7 while completing this problem.
Part A
How many grams of NH3 can be produced when 4.50 L of NO2 reacts at 385 ° C and 705 mmHg ?
Express your answer with the appropriate units.
µA
1.20
m =
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You may want to begin by using the ideal gas law equation to solve for the number of moles NO2. The equation
is
PV = nRT
where P is pressure, V is volume, n is an amount of a gas, R is the ideal gas constant, and T is temperature.
Then, mol NO2 can be converted to g NH3 by consecutively multiplying by the appropriate mole-mole and
molar mass factors.
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