2. Decomposition of CaCO3(s) into CaO(s) and CO2(g), ​ΔHᵒ 25ᵒ = 178 kJ

Q: Study the reactions for the formation of compounds from their elements. 1. C (s) + O2 (g) → CO2 (g)…

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A: Given :  5.  ∆Hf° of NO2 = 33.9 KJ/mol  ∆Hf° of N2O4 = 33.9 KJ/mol  6.  Mass of Al = 15 gram…

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A: A process is said to be endothermic if it absorbs heat in the process whereas in exothermic process…

Q: Engaging Activities Use the equation below for Problems 1 and 2 2FeCl₂ + Cl₂ → 2FeCl₂ ΔΗ = .125 kJ…

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Q: How much heat is absorbed when 30.00 g of C(s) reacts in the presence of excess SO2(g) to produce…

A: 5 C(s) + 2 SO2(g) → CS2(l) + 4 CO(g) ΔH° = +239.9 kJ Form the above reaction: Heat of absorption per…

Q: The formation of rust (Fe2O3) from solid iron and oxygen gas releases -1.7  103 kJ. 4 Fe(s) + 3…

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Q: 9.98. Hydrogen combines with oxygen in fuel cells according to the thermochemical equation 2 H2 (g)…

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Q: Liquid hydrogen peroxide, an oxidizing agent in many rocket fuel mixtures, releases oxygen gas on…

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Q: When 0.850 g of C was burned in oxygen in a constant volume calorimeter, 27.9 kJ of energy as heat…

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Q: The reaction of hydrogen sulfide(g) with oxygen(g) to form water(g) and sulfur dioxide(g) proceeds…

A: Answer: In this question enthalpy of the given balanced reaction in which combustion of 2 mole H2S…

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A: The expression for the calculation of work done is shown below: W =-∆ngRT where; ∆ng = change in…

Q: Write balanced equations for each of these reactions, including the heat term: Calcium metal reacts…

A: When heat is released ∆H = -Ve When heat is absorbed ∆H = +Ve

Q: if 11.2 g of H2 (g) (MM = 2.016 g/mol) were to react according to the balanced equation given below,…

A: We have to calculate the heat released amount.

Q: Octanitrocubane is a high explosive detonating with shock. It decomposes according to the following…

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Q: The thermite reaction produces a prodigious amount of heat energy. Given the thermochemical reaction…

A: Reaction equation :8Al(s) + 3Fe3O4(s) →              4Al2O3(s) + 9Fe(s)∆H°rxn = -3350.0 kJmolMass of…

Q: If 5.60 mol of a substance releases 14.9 KJ when it decomposes, what is the ΔH for the term KJ/mol…

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Q: The lead-acid storage battery is the oldest rechargeable battery in existence. It was invented in…

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A: Given reaction, N2H4  + O2→ N2 + 2H2O   ∆H = -622.4 KJ 1 mole of combustion of N2H4 produces -622.4…

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A: Given that:  Mass of B2H6 = 116g Molar mass of B2H6 = 27.66g/mol Moles of B2H6 = mass ÷ molar mass

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Q: How many grams of iron are formed when 2.28x10^3 kJ of heat evolves from the reaction?…

A: Given Reaction Fe2O3(s) +2 Al(s)  → Al2O3(s)   + 2 Fe(s)∆Hreaction  = -852 kJHeat evolves =- 2.28 *…

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Q: if 11.2 g of H2 (g) (MM = 2.016 g/mol) were to react according to the balanced equation given below,…

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Q: Use the References to access important values if needed for this question. The reaction of hydrogen…

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Q: 2. Consider the following thermochemical equations: C(graphite) + 0, (g) → co; (g) AH = -393.5 kJ H2…

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A: Moles of H2O2 =mass of H2O2 molar mass of H2O2 =  534 mol   By stoichiometry of reaction : 2 moles…

Q: N2(g) + 3Cl2(g) 2NCl3(l) ∆H°rxn = +460 kJ The reaction is ____thermic, heat flows ____ bonds…

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Q: How much heat is liberated at constant pressure if 0.938 g of calcium carbonate reacts with 73.2 mL…

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A: Given reaction: CaCO3(s) + 2HCl (aq) →CaCl2 (aq) + H2O (l) + CO2 (g) For this reaction, ∆H0 r= -14.2…

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.