A scientist measures the standard enthalpy change for the following reaction to be -34.0 kJ: C₂H4 (9) + H₂O(g) → CH3CH₂OH(g) Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of H₂O(g) is kJ/mol. Species ΔH (kJ/mol) CH3CH₂OH(9) C₂H4 (9) -235.1 52.3

Q: Adding 5.47 g of to 140 g of water in a coffee-cup calorimeter (with stirring to dissolve the salt)…

A: According to the question, we are adding 5.47 g of NH4NO3 to 140 g of water in a coffee-cup…

Q: A 2.00 g sample of a salt (MX(s)) is added to 20.0 g of water at 22.0 °C in a calorimeter. The…

A: Given that, a 2.00 g of a sample of a salt MX(s) is added to a 20.0 g of a water at 22.0oC. So, the…

Q: Given that the molar enthalpy of combustion for propan-1-ol, C3H7OH(l), is –2008.6 kJ/mol,  what is…

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Q: The standard enthalpy change for the following reaction is -822 kJ at 298 K.2 Na(s) + Cl2(g)    2…

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Q: Calculate the enthalpy of reaction (ΔHrxn), in kJ, for the following reaction: Fe2O3(s) + 3 CO(g) →…

A: According to Hess's law change of enthalpy in a chemical reaction is same regardless of whether the…

Q: 2. Write the thermochemical equation when one mole of nitrogen gas, N, reacts with one mole of…

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Q: 150.0 mL of dilute hydrochloric acid is placed in a coffee cup calorimeter. The initial temperature…

A: Volume of HCl = 150.0 mL Initial temperature = T1 = 14.5 °C Mass of Mg = 0.575 g Molar enthalpy…

Q: How much heat is produced by the complete combustion of 264 gg of CH4CH4?

A: Given:CH4g+2O2g→CO2g+2 H2Og∆Hrxn°=-802.3 kJ

Q: 3. Using standard enthalpies of formation (∆Hfº), calculate the enthalpy change for the following…

A: For the reaction: 2H2S(g) + 3O2(g) → 2H2O(l) + 2SO2(g)                                 The standard…

Q: The standard enthalpy of formation of CO(g) is –111 kJ/mol [refer to this equation C(s) + 1/202g) →…

A: Interpretation -  To determine the enthalpy (∆Ho) for the reaction which is given as - 2C(s) + O2…

Q: The standard enthalpy change for the following reaction is -511 kJ at 298 K.Br2(l) + 3 F2(g)--->2…

A: The objective of the question is to find the standard enthalpy change for the reaction 1/2 Br2(l) +…

Q: The enthalpy change for the reaction of hydrogen gas with fluorine gas to produce hydrogen fluoride…

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

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Q: Use the following information to determine the enthalpy for the reaction shown below. CS2(l) +…

A: The enthalpy of the reaction is calculate using Hess' law. This law states that regardless the…

Q: In a coffee-cup calorimeter, 120.0 mL of 1.4 M NaOH and 120.0 mL of 1.4 M HCl are mixed. Both…

A: Volume of 1.4 M NaOH taken, V = 120.0 mL Volume of 1.4 M HCl taken, V = 120 mL

Q: Part A) Use standard enthalpies of formation to calculate the standard change in enthalpy for the…

A: The standard enthalpy of formation is the enthalpy of formation measured under the standard…

Q: A scientist measures the standard enthalpy change for this reaction to be 33.3 kJ/mol. CO₂(g) +…

A: “Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: In the laboratory, a "coffee cup" calorimeter, or constant pressure calorimeter, is frequently used…

A: qw = - qTin mw × cw × (Tf - Ti) = - { mtin × ctin × (Tf - Ti) On substituting the values into it, we…

Q: A scientist measures the standard enthalpy change for the following reaction to be -59.4 k) :…

A: Answer: Enthalpy of a reaction is always equation to the difference of enthalpy of formation of…

Q: 3. When a student mixes 50 mL of 1.0 M HCI and 50 mL of 1.0M NaOH in a coffee- cup calorimeter, the…

A: given - 50 ml of 0.1 HCl  50 ml. of 0.1 NaOH density = 1 g/ml specific heat = s = 4.18 J/g K initial…

Q: Calculate the standard enthalpy change for the following reaction: 2CH3OH(l)   +   3O2(g)   →…

A: Heat released and absorbed during a reaction by change in bonding is defined as heat of reaction or…

Q: In a coffee-cup calorimeter, 120.0 mL of 1.1 M NaOH and 120.0 mL of 1.1 M HCl are mixed. Both…

A: Given, In a coffee-cup calorimeter, 120.0 mL of 1.1 M NaOH and 120.0 mL of 1.1 M HCl are mixed. Both…

Q: The standard enthalpy of formation (ΔH°f) for HNO3 (l) is –173.22 kJ/mol.  Which of the following…

A: The standard enthalpy of formation of compound is change of enthalpy during the formation of  1 mole…

Q: Use standard enthalpies of formation to calculate the amount of heat released per kilogram of…

A: The enthalpy of combustion of methanol (ΔHcom) is defined as the equation (1) where ΔfHCH3OH is the…

Q: Consider the following reaction: CO2 (g) + 4H2(g) —> CH4 (g) + 2H2O (g). CO2 (g): -384.60 kJ/mol…

A: To solve this problem we have to calculate the enthalpy change of the given reaction .

Q: Use the example shown to calculate the reaction enthalpy, ΔH, for the following reaction:…

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Q: For the combustion of methane(CH4)   CH4 (g)  + 2 O2 (g)  -->  CO2 (g) + 2H2O (g)       Δ H = -882…

A: In a thermochemical equation, the term, ∆H , represents the change in heat energy per mol reaction.…

Q: The addition of 3.15 g of Ba(OH)₂ 8H₂O to a solution of 1.52 g of NH SCN in 100 g of water in a…

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Q: Here is another question that is similar to the last that I do not know where to start: When a…

A: Given mass of NH4NO3 is 15.44 g  Given mass of water is 150.00 g and heat capacity of water is 4.184…

Q: Determine the enthalpy of reaction for HCl(g) + NaNO₂(s) → HNO₂(l) + NaCl(s) 2NaCl(s) + H₂O(l) →…

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Q: In a coffee-cup calorimeter, 110.0 mL of 1.1 M NaOH and 110.0 mL of 1.1 M HCl are mixed. Both…

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Q: A scientist measures the standard enthalpy change for this reaction to be 2863.2 kJ/mol. 6CO2(g) + 6…

A: We’ll answer the first question since the exact one wasn’t specified. Please submit a new question…

Q: You add some of the white crystals to a small test tube filled with water. The water in the test…

A: This can be calculated by specifi heat formula, CP = (dH/dT)P dH = Enthalpy change  dT = Temperature…

Q: A scientist measures the standard enthalpy change for the following reaction to be 6.7 kJ : CO(g) +…

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Q: Given the following data 2 CIF (g) + O₂(g) → Cl₂ O(g) + F₂0(g) 2 CIF 3 (g) +202(g) → Cl₂ O(g) +…

A: The enthalpy change is a state function and the Hess law states that the change of enthalpy in a…

Q: Use the standard reaction enthalpies given below to determine ΔH°rxn for the following reaction:…

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Q: The standard molar enthalpy of formation of diborane, B₂H₁ (g), cannot be determined directly…

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Q: 8. Sodium reacts violently with water to form sodium hydroxide as shown in the following equation:…

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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.