Phosphoryl chloride, POCI3(g), is used in the manufacturing of flame retardants. It is manufactured in an equilibrium process in which phosphorus trichloride reacts with nitrogen dioxide to form POCI3(g)and NO(g) according to the following equation: PC13 (g) + NO₂ (g) = POCI3 (g) + NO (g) + 228.93kJ At 298K, the equilibrium concentration of POCI3 was 0.68 mol/L, the concentration of NO was 0.72mol/L, the concentration of PCI 3 was 0.62 mol/L, and the concentration of NO₂ was 0.56 mol/L. E' I с a. 2.5 moles of NO (g) is added to the 2.0 L reaction chamber. What is the new concentration of NO (g) when equilibrium is re-established? PC13 (g) POCI 3 (g) NO(g) E + NO₂ (g)
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.
Phosphoryl chloride, POCl3(g), is used in the manufacturing of flame retardants. It is manufactured in an
equilibrium process in which phosphorus trichloride reacts with nitrogen dioxide to form POCl3(g)and NO(g)
according to the following equation:
PCl3 (g) + NO2 (g) ⇌ POCl3 (g) + NO (g) + 228.93kJ
At 298K, the equilibrium concentration of POCl3 was 0.68 mol/L, the concentration of NO was 0.72mol/L, the
concentration of PCl3 was 0.62 mol/L, and the concentration of NO2 was 0.56 mol/L.
a. 2.5 moles of NO (g) is added to the 2.0 L reaction chamber. What is the new concentration of NO (g)
when equilibrium is re-established?
b. What would happen to the Keq value if the temperature of the reaction chamber was increased from
298K to 500K? Explain.
Trending now
This is a popular solution!
Step by step
Solved in 4 steps with 3 images
