Which of the following equations is a mathematical definition of enthalpy? Ο ΔΗ-ΔG- TAS Ο ΔΗ-ΔS- ΤG Ο ΔΗ-ΔG+ TAS ΔΗ-ΔΕ+ Δ Ο ΔΗ-ΔS+ΤAG Ο ΔΗ-ΔΕ -ΡAV

Q: Expressing amounts of energy in different energy units is necessary to solve many chemistry…

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Q: A chemist carefully measures the amount of heat needed to raise the temperature of a 1.65 kg sample…

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Q: The enthalpy changes for two reactions are given. Br2 (l) + F2 (g) → 2BrF (g)         ΔH = x kJ Br2…

A: The enthalpy changes of the two reactions are as follows: Br2(l) + F2(g) → 2BrF(g)…

Q: Which of the following equations is an exothermic reaction?   a H2 (g) + ½ O2 (g) → H2O (l) ΔH =…

A: Exothermic reaction Reaction in which Energy is released so it is exothermic reaction.

Q: Given the following reactions Reactions Na(s) + Cl₂(g) → Na(g) + Cl(g) 2 Na(g) + Cl(g) → Na*(g) + Cl…

A: Answer:Extensive properties are the properties that depend on the size of the system. Enthalpy…

Q: Which of the following is the correct definition of enthalpy? Enthalpy is the heat of combustion.…

A: The enthalpy can be written asΔH =  ΔU + PΔV Where ΔU is the change in the internal energyP is the…

Q: 4NH3(g) + O2(g) → 2N2(g) + 6H2O(g)          ΔrH = -1267 kJmol-1  2NO(g) + O­2(g) → 2NO2(g)     ΔrH…

A: For a chemical reaction to be spontaneous, Gibbs free energy, ∆rG should be negative. ∆rG is…

Q: Consider the following reactions:                  C2H6 (g)  +  7/2 O2 (g)  →  2 CO2 (g)  +  3 H2O…

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Q: Given the standard enthalpy changes for the following two reactions: (1) 2Pb(s) + O2(g) → 2PbO(s)…

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Q: A chemist carefully measures the amount of heat needed to raise the temperature of a 196.0 g sample…

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Q: Calculate the standard enthalpy for the reaction: 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g), given the…

A: Given: (1) N2(g) + O2(g) → 2NO(g); ΔHrxn = -43.1 kcal mol-1  (2) N2(g) + 3H2(g) → 2NH3(g); ΔHrxn =…

Q: A chemist carefully measures the amount of heat needed to raise the temperature of a 1.25 kg sample…

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Q: Calculate the standard enthalpy for the reaction: 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)

A: Let us denote the given reactions by reaction 1,2,3, and 4 from up to down respectively. Now we have…

Q: Based on the data below, what is the reaction enthalpy for the formation of anhydrous aluminum…

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Q: Using these reactions and enthalpies calculate the enthalpy of reaction for C3H4(g) + 2 H2(g) →…

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Q: Use Hess's Law to calculate the enthalpy change for the reaction WO3(s) + 3H2(g) → W(s) + 3H2O(g)…

A: The enthalpy of the first reaction is -1685.4 kJ. The enthalpy of second reaction is -477.84 kJ.

Q: Calculate the standard enthalpy for the reaction: 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g), given the…

A: Data given: N2 (g) + O2 (g) → 2NO(g), ∆Hr×n = -43.1 kcal mol–1 ------------ (1)  N2 (g) + 3H2 (g) →…

Q: Calculate the standard enthalpy for the reaction: 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g), given the…

A: Required equation: 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g) N2(g) + O2(g) → 2NO(g) ΔHrxn = -43.1 kcal…

Q: Given the following two reactions and their enthalpy changes,             2 ClO2 (g)   -->   Cl2 (g)…

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Q: Calculate the standard enthalpy for the reaction: 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g), given the…

A: Hess's law states that the enthalpy change for an overall reaction is the sum of enthalpy changes of…

Q: Given the following two reactions and their enthalpy changes,             2 ClO2 (g)   -->   Cl2…

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Q: A chemist carefully measures the amount of heat needed to raise the temperature of a 162.0 g sample…

A: Answer: When heat is added to a substance, its temperature rises but the value of temperature rise…

Q: Consider the reaction of sodium metal and water. 2Na(s) + 2H20(1) → 2NaOH(aq) + H2 (g) AH = -369 kJ…

A: 2Na(s)+2H2O(l) --->2NaOH(aq)+H2(g) ∆H = -369KJ On reversing the direction of reaction, sign of…

Q: Calculate the AH of the following reaction using the reactions given below C3HS (g) → 3 C(s) + 4…

A: The given reaction is, C3H8(g) ---> 3C(s) + 4H2(g)   The equation for the given reaction are, 1)…

Q: The standard enthalpy change for the following reaction is -56.0 kJ at 298 K. Na(s) + 1/2 H₂(g)…

A: Important points needs to be remember for enthalpy change If a given chemical reaction is reversed…

Q: Calculate the standard enthalpy for the reaction: 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g), given the…

A: The given data is as follows: 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)          ∆Hr=? N2(g) + O2(g) →…

Q: Calculate the enthalpy of the reaction 2NO(g) + O2(g)→2NO2(g) given the following reactions and…

A: The given data is as follows: Equation 1: 12N2(g) + O2(g) → NO2(g),             ∆HA∘=33.2 kJ…

Q: When 1.42 g of iron reacts with 1.80 g of chlorine, 3.22 g of iron(II) chloride (FeCl2, molar mass =…

A: Iron reacts with chlorine to form iron(II) chloride. When 3.22 g of  is formed, 6.8 kJ of heat is…

Q: Constants | Periodic Table Chemical energy is released or absorbed from reactions in various forms.…

A: In the given question we have to calculate the heat absorbed when 3.50 mol of A reacts with B. The…

Q: Which of the following equations is a mathematical definition of enthalpy? O AH = AS - TAG Ο…

A: Enthalpy change is the amount of heat evolved or absorbed in a chemical reaction carried out at…

Q: Given the following thermochemical equations, C2 (g) +5/2O2 (g) → 2CO2 (g) +H2O (l) ΔH = −1299.5kJ…

A: Given: C2H2(g)+52O2(g)→2CO2(g)+H2O(l)     ∆H=-1299.5 kJ---eqn(1)C(s)+O2(g)→CO2(g)…

Q: What is the enthalpy change for the first reaction? CH4(g) + 1/2O2(g) → CH3OH(g) ΔH =

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Q: e standard enthalpy of formation (ΔH°f) for NaNO3 (l) is –492.71 kJ/mol.  Which of the following…

A: When a chemical reaction occurs, reactants are converted to products. This causes a change in the…

Q: Given the following two equations and their respective enthalpies: S (s) + O2(g) → SO2(g) AH =…

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Q: From the following enthalpies of reaction: 2 H2(g) + O2(g) → 2 H2O(l)…

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Q: 2 H,S (g) +3 0, (g) → 2 H,0 (1) + 2 SO, (g) Exothermic or endothermic

A: Hydrogen sulfide reacts with oxygen to form water and sulfur dioxide. The equation for the balanced…

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.