25. Phosgenite, Pb₂Cl₂CO3, is a lead-based compound found in ancient Egyptian cosmetics. Phosgenite was prepared by the reaction of PbO, NaCl, H₂O, and CO₂. An unbalanced equation of the reaction is PbO(s) + NaCl(aq) + H₂O(1) + CO2(g) Pb₂Cl₂CO3(s) + NaOH(aq) (a) Balance the equation. (b) How many grams of phosgenite can be obtained from 10.0 g of PbO and 10.0 g of NaCl in the presence of excess water and CO₂? (c) If 2.72 g of phosgenite is produced in the laboratory from the amounts of starting materials stated in part (b), what is the percent yield of the reaction?
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.
25.
![**25.** Phosgenite, Pb₂Cl₂CO₃, is a lead-based compound found in ancient Egyptian cosmetics. Phosgenite was prepared by the reaction of PbO, NaCl, H₂O, and CO₂. An unbalanced equation of the reaction is:
\[ \text{PbO}_{(s)} + \text{NaCl}_{(aq)} + \text{H}_2\text{O}_{(l)} + \text{CO}_2_{(g)} \rightarrow \text{Pb}_2\text{Cl}_2\text{CO}_3_{(s)} + \text{NaOH}_{(aq)} \]
**(a)** Balance the equation.
**(b)** How many grams of phosgenite can be obtained from 10.0 g of PbO and 10.0 g of NaCl in the presence of excess water and CO₂?
**(c)** If 2.72 g of phosgenite is produced in the laboratory from the amounts of starting materials stated in part (b), what is the percent yield of the reaction?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fbeb4d536-f388-44bc-91f3-a72ed115bd90%2F4c5408e4-2f6c-4c9b-83bb-964c862255dd%2Fv5e69a_processed.png&w=3840&q=75)
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