2. Nitric acid, which is among the top 15 chemicals produced in the United States, was first prepared over 1200 years ago by heating naturally occurring sodium nitrate (called saltpeter) with sulfuric acid and collecting the vapors produced. Calculate AH°rxn for this reaction. AH°f [NaNO3(s)] = -467.8 kJ/mol; AH°f [NaHSO4(s)]=-1125.5 kJ/mol; AHᵒf [H2SO4(1) = -814.0 kJ/mol; AH°f [HNO3(g)] = -135.1 kJ/mol NaNO3(s) + H2SO4(1)→ NaHSO4(s) + HNO3(g) [(-135.1) + (-1125.5)]-[(-814.0) + (-467.8)] -1260.6-(-1281.8) = 21.2 KS A)-644.2 kJ B) 644.2 kJ C) 21.2 KJ D) -21.2 kJ E)-291.4 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.
How would you answer this question?
![B)-139.5 KJ
C) 104.4 kJ
D) 139.5 kJ
E) -104.4 kJ
[(-657,0) + 2(-241.8)]-[(923) + (-910.9)]
-1140.6 - (-1280.1) = 139.5 K)
F
2. Nitric acid, which is among the top 15 chemicals produced in the United States, was first prepared over 1200
years ago by heating naturally occurring sodium nitrate (called saltpeter) with sulfuric acid and collecting the
vapors produced.
poci
Calculate AH°rxn for this reaction. AH°f [NaNO3(s)] = -467.8 kJ/mol; AH°f [NaHSO4(s)] =-1125.5 kJ/mol;
AH°f [H2SO4(1) = −814.0 kJ/mol; AH°f [HNO3(g)] = -135.1 kJ/mol
A)-644.2 kJ
B) 644.2 kJ
C) 21.2 kJ
D) -21.2 kJ
E)-291.4 kJ
NaNO3(s) + H2SO4(1)→ NaHSO4(s) + HNO3(g)
[(-135.1) + (-1125.5)]-[(-814.0) + (-467.8)]
-1260-6-(-1281.8) = 21.2 k)
and the boiling water in the beaker. The temperature of the polling water is also the temperatur
hot metal.
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