Match the following enthalpy changes with the reactions below: enthalpy change of combustion, enthalpy change of formation, enthalpy change of solution, enthalpy change of hydration, enthalpy change of atomisation, enthalpy change for ionisation, enthalpy change for electron affinity:     2C (s)   +         3H2 (g)   +       O2 (g)             →        CH3CH2OH (l) DH =  20     (NH4)2SO4 (s)             →        2NH4+(aq)        +          SO42-(aq)               DH =     Na+(g)                          →                    Na+(aq)                                           DH =     C (s)                 +                      O2 (g)               →        CO2 (g)                   DH = formation  / combustion                                                   Na (s)                           →                    Na (g)                                                         DH = atomisation     Na (g)                           →                    Na+(g)               +          e-                          DH =     F (g)                 +                      e-                     →                    F - (g)                   DH = electron affini

Q: Which of the following is the most basic solution (highest [UH ])? O pH 12 %3D O pOH = 1.0 o [OH] = ...

A: 1) pH=12 we know, pH + pOH = 14 pOH = 14 - 12 = 2

Q: MeO. ZON A

A: Given reaction is electro cyclisation reaction. 

Q: The reaction 8 CO2(g) + 10 H20(g) 2 C4H10(g) + 13 O2(3) has AG° = -5407 kJ. Determine the value of A...

A:

Q: Aluminum reacts with iodine in the presence of hot water, to exothermically produce aluminum iodide....

A: As the per the guidelines we are supposed to answer the first three sub parts to be solved other sub...

Q: strong acids, weak acids, strong bases, or weak bases.

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Q: Determine the molecular formulas for compounds having the following empirical formula and molar mass...

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Q: You titrate 0.1 L of 0.2 M HCI with 0.1 M NaOH. The half equivalence point will be reached when adde...

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Q: A sample of solid NH,NO3 was placed in an empty container. It decomposes according to the following ...

A: Ammonium nitrate decomposes into nitrogen oxide and water. The equation for the balanced chemical re...

Q: Is there a difference when the needle or metal clip is placed on the surface of distilled water and ...

A: Please find your solution below : Intermolecular forces of attraction are the forces that act betwee...

Q: Q1\ Answer with (True ) or (False) of the following : -innoring utical 6- Burettes, pipettes item fo...

A: 6. False..Burettes used in chemical analysis and pipettes used in manual method.  7 True 8.False. 9....

Q: An unknown compound has the following chemical formula: PAS where x stands for a whole number. Measu...

A: Molecular formula: In a molecular formula we describe the number of atoms of all the elements presen...

Q: Create two separate structures for the compound C5H9NO that are not amines.

A: Molecular formula: In a molecular formula we describe the number of atoms of all the elements presen...

Q: Calculate the number of nitrogen atoms in a 120.0 g sample of dinitrogen tetroxide (N,04). Be sure y...

A: Mass of nitrogen dioxide (N2O4) = 120.0 g  Number of nitrogen atoms = ? 

Q: In separate titrations, equal volumes of 0.1 M HCI and 0.1M HC,H3O2 (weak acid) are titrated with 0....

A: Given: Equal volumes of 0.1 M HCl and 0.1 M acetic acid is titrated against 0.1 M NaOH.

Q: а. HNO3 H2SO4 `NO2 но b. AICI3 CI С. Br2 FeBr3

A: The characteristic reaction of the aromatic compound is an aromatic electrophilic substitution react...

Q: For items 10 to 12: 4HCI + HNO3 Cl2 + NOCI + 2H2O 10. What is the mole ratio of HCI to H20? 11. What...

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Q: Determine the rate law for the production of nitrosyl fluoride (NO2F) that occurs according to the f...

A: 2NO2(g) + F2(g) ----> 2NO2F(g)    

Q: at mass of

A:

Q: The activation energy for a certain first-order reaction is 139 kJ/mol. if the rate constant is 0.2...

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Q: 4. Nitric acid is a corrosive and strong acid. It has a molarity of 15 M when purchased from a chemi...

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Q: i. The first and second ionization energies of 02 are similar to each other at ~1200 kJ/mol, while t...

A: N2 has MO diagram depicted on the left side while O2 and F2 have the MO diagram depicted on the righ...

Q: You were asked to determine the acid content of vinegar and soda samples. You performed a simple aci...

A: Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for yo...

Q: TRUE OR FALSE a. It requires more energy to break N-N bond (N2O4) than to break the N-N bond in N2 ...

A: The strength of the bonds depends upon their bond energy . As the number of electron pairs increase ...

Q: By which substitution mechanism (SN1 or SN2) did the reaction occur? How did you know? For what rea...

A: The reaction is happened via SN1 mechanism. In SN1 mechanism first leaving group leaves in rate dete...

Q: You react 85.6 mL of 0.32 M AGNO3 with excess aqueous K2CrO4. What mass of solid precipitate is form...

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Q: Catalysts function by decreasing the required to form the transition state: Activation energy (A) (B...

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Q: The formation of nitrogen monoxide from its elements has an equilibrium which favors reactants: N2 (...

A: Nitrogen reacts with oxygen to form nitrogen oxide. The equation for the balanced chemical reaction ...

Q: HF is a weak acid and NH3 is a weak base. Which of the following shows the correct order of increasi...

A: Sodium chloride is formed from the reaction of a strong acid and a strong base. In the formation of ...

Q: mass of water is

A:

Q: You were asked to determine the acid content of vinegar and soda samples. You performed a simple aci...

A:

Q: 2. Calculate the solvation free energy AG of Mg using the Born theory. Given that the ionic radius o...

A: Solution -

Q: ections: Balance the chemical equation below and complete its mole ratio on the table below. _C3H8 C...

A: C3H8 + 5O2 ----> 3CO2 + 4H2O  

Q: 6. Which is the best progress of reaction diagram for the reaction? А. С. Reaction Progress Reaction...

A: The explanation of the following is:  

Q: Which of the following alkyl halides would afford the indicated product upon reaction with sodium et...

A:

Q: Consider the reaction, N204(g) = 2 NO2(g) where the value for Ke is 1.7 x 10-6. The initial concentr...

A: Given Reaction:-  N2O4(g)  <------> 2NO2(g)  Kc =  1.7 × 10-6  

Q: Calculate the percentage mass composition of the following substance a. Ethanol ( C2H6O ) b. Gypsum...

A:

Q: 1.0 x 10-11 moles of HCl are added to 1.OL of H20. What is the pH? О 3.0 O 10.0 O 11.0 О 1.0 O 7.0

A: Moles of HCl = 1.0 × 10-11 moles Volume of water = 1.0 Liter

Q: i. The ionization energy of fluorine (F) is ~1700 kJ/mol, while the ionization energy of difluorine ...

A: 1.Above diagram on right side is applicable for fluorine gas.  In fluorine (F) the HOMO( highest occ...

Q: What is the ppm of the C,H,0, if 3.0 mg of it found in 300 kg of drinking water? Type the numerical ...

A:

Q: An ideal gas ina cylinder fitted with a piston expands at constant temperature from a pressure of 7 ...

A: When a gas expands the work will be done by the gas on the surrounding. When the work is done by the...

Q: From your point of view, express your idea on the word "Organic"

A: The word "Organic "really means the things that are natural or related to nature. In general, the wo...

Q: Calculate the number of nitrogen atoms in a 70.0 g sample of dinitrogen tetroxide (N,0.).

A: Given :- mass of N2O4 = 70.0 g  To calculate :- number of nitrogen atoms 

Q: A reaction that requires less energy to reach the transition state will be a reaction. (A) (B) Faste...

A:                                 Answer Reaction that requires less energy to reach the transition st...

Q: 14 Which setts) of quantum numbers shown below are not allowed? Mark all that are not allowed, .ther...

A: Quantum number describe the location of electron in an atom i.e. electron is present in which shell,...

Q: A solution contains 6.02x10-3 M sodium sulfide and 1.32x10-2 M ammonium phosphate. Solid lead nitrat...

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Q: 3. What is the molar concentration of a solution that is 28.15% HNO, (w/w) (MM= 63.01 g/mol)? The sp...

A:

Q: Ammonia (NH,) chemically reacts with oxygen gas (o,) to produce nitric oxide (NO) and water (H,0). W...

A: Given data is as follows: The mass of ammonia given = 1.2 g The mass of oxygen gas consumed = ?

Q: Consider the reaction. A(aq) = 2 B(aq) K. = 6.64 × 10-6 at 500 K If a 2.30 M sample of A is heated t...

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Q: TRUE OR FALSE: Metals at the lower position in the Ellingham diagram (ex: Aluminum Magnesium and Ca...

A:     Statement : Metals at lower position in the Ellingham diagram , are not stable and easily forms ...

Q: Measurements show that the energy of a mixture of gaseous reactants increases by 301. kJ during a ce...

A: Work done on mixture = - 104 kJ ∆U = +301 kJ  

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.