== Q5.50 Homework Unanswered What is the enthalpy of formation (AH°f, in kJmol-¹) of Pb(NO3)2(s)? ✪ Respond with the correct number of significant figures in scientific notation (Use E notation and only 1 digit before decimal e.g. 2.5E5 for 2.5 x 105) Type your numeric answer and submit
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.
![**Question 5.50**
**Homework · Unanswered**
**What is the enthalpy of formation (\( \Delta H_f^\circ \), in kJ/mol) of Pb(NO\(_3\)_2(s))?**
*Respond with the correct number of **significant figures** in **scientific notation** (Use E notation and only 1 digit before the decimal, e.g., 2.5E5 for 2.5 x 10\(^5\)).*
Type your numeric answer and submit
**Unanswered • 4 attempts left**
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According to the question we have,
The lead(II) nitrate and we have to find the enthalpy of formation for the compound.
The lead(II) nitrate is formed by, the balanced chemical reaction is as follows,
2 Pb(NO3)2 (s) 
2 PbO (s) + 4 NO2 (g) + O2 (g)
The for the reaction is = + 598 KJ / mole (taken from an online source)
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