Using the enthalpies of reaction computed in the data and the value give for the enthalpy of formation of liquid water, show the Hess law determination of the enthalpy of formation of solid magnesium oxide

Q: Give the mathematical expression of enthalpy.

A: Enthalpy: it is the total amount of heat in a particular system. That is the amount energy absorbed…

Q: What is meant by the standard enthalpy of formation?

A: The difference in enthalpy during formation one mole of desired compound from its reactant elements…

Q: Why can we measure only changes in enthalpy, not absolute enthalpy values?

A: Enthalpy is the sum of the system's internal energy and the product of its pressure and volume.…

Q: The enthalpy of formation of ammonia is -46 kJmol-1 and the bond dissociation enthalpies of nitrogen…

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Q: If 46.1g of copper at 11.6 degrees is place in 85.0g of water at 72.4 degrees what is the final…

A: Heat loss is given by the formula           -q = mC∆T     Or      -q = mC(Tf - Ti)  Where,  q=…

Q: The heat equation, as given in the introduction, can also be rearranged to calculate the mass or…

A: The specific heat required to raise the temperature of a substance is given as:

Q: a sheet of gold weighing 8.4g and at a tempearture of 14.2 C is placed flat on a sheet of iron…

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Q: how to write the enthalpy cycle?

A: The previous answer has shown all the necessary calculations and enthalpy changes.  In case you want…

Q: Measurements show that the energy of a mixture of gaseous reactants increases by 368. kJ during a…

A: We have to calculate the change in enthalpy and nature of reaction.

Q: Using any necessary data from appropriate sources, predict the enthalpy of formation of KCl and KF…

A: Born-Haber cycle is used to find the lattice enthalpy and enthalpy of formation of an ionic compound…

Q: For an exothermic reaction, how is the measured temperature change affected if some of the heat…

A: The amount of heat involved in a chemical of physical process is measured using the device called…

Q: Use standard enthalpies of formation to calculate the enthalpy change for the reaction below. Show…

A: Heat change during the reaction is called the Enthalpy of the reaction.

Q: Rearrange the equation to solve for m. m = When a substance with a specific heat of 0.180 J/g C is…

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Q: O THERMOCHEMISTRY Understanding the definition of enthalpy Measurements show that the energy of a…

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Q: The enthalpy of sublimation (direct conversion from solid to gas) of carbon dioxide is 26.1 kJ/mol.…

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Q: One statement of the first law of thermodynamics is that pick one the amount of work done on a…

A: The first law of thermodynamics is basically the conservation of energy. It stats that the total…

Q: What is molar enthalpy?

A: Given, define molar enthalpy.

Q: The standard molar enthalpy of formation of NH3(g) is –45.9 kJ/mol. What is the enthalpy change if…

A: Given, The standard molar enthalpy of the formation of NH3(g) is given by= -45.9 kJ/mol The mass of…

Q: Many portable gas heater and grills use propane as a fuel. Using standard enthalpies of formation,…

A: Thermodynamic is the branch of chemistry that mainly deals with the heat transfer between system and…

Q: The enthalpy change for heating a one mole sample of an ideal, monoatomic gas at 25°C is 3.75…

A: Enthalpy is the heat content of a system. The enthalpy change of a reaction is roughly equivalent to…

Q: energy

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Q: In the laboratory a student finds that it takes 34.3 Joules to increase the temperature of 13.7…

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Q: State two reasons why energy changes in chemical systems are measured at standard conditions of…

A: The energy changes in the chemical systems are measured at standard conditions of temperature and…

Q: How many kilojoules of heat will be released when exactly 1 mole of molybdenum, Mo, is burned to…

A: We have to determine the amount of heat that will be released when exactly 1 mole of molybdenum, Mo,…

Q: What is enthalpy change for a reaction and how does this differ from the experimental heat flow…

A: Definition~ Enthalpy is the measurement of energy in a thermodynamic system. The quantity of…

Q: What is the enthalpy change if 40.0 g of  is allowed to react with an excess of carbon?

A: Enthalpy change : It the energy change i.e. when the number of moles of products will be formed from…

Q: A common technique for forming metal electrodes on electronic devices is evaporation in a vacuum. In…

A: Given Data: The enthalpy of vaporization (ΔHvap) for gold = 310.9 kJ/mol given mass of  liquid gold…

Q: I can determine mathematically how much energy will be produced or absorbed for a given chemical…

A: Energy produced or released ( or enthalpy change ) for a reaction can be determined using standard…

Q: Measurements show that the energy of a mixture of gaseous reactants increases by 120. kJ during a…

A: From first law of thermodynamics,   ∆E = ∆H + W  where ∆E = change in energy ∆H = change in enthalpy…

Q: 4. Methane burns in air to form carbon dioxide and water according to the following equation: CH +…

A: 1) When ΔH < 0, the reaction is Exothermic. When ΔH > 0, the reaction is Endothermic. 2)In…

Q: None

A: Enthalpy Change Calculation:Enthalpy change (ΔH) is the sum of the energy change (ΔE) and the work…

Q: The standard heat of formation for NO2 is 33.2kJmol. How much energy is required to form 810.0 g of…

A: Given : The standard heat of formation for NO2 is 33.2kJ/molWhich implies that 33.2 KJ of heat is…

Q: Under what conditions does the enthalpy change equal the heat of a process

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Q: How do I calculate enthalpy of state changes?

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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.