What is the change in enthalpy in kilojoules when 2.30 mol of Mg is completely reacted according to the following reaction     2 Mg(s)+O₂(g) → 2 MgO(s) ∆H =-1204 kJ

Q: The change (delta) E of a system that absorbs 12.4 J of heat and does 4.2 J of work on the…

A: Given that, ∆H = 12.4 J w=4.2 J ∆E = ?

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Q: Hot packs can be made from calcium chloride by mixing/reacting it with water (reaction shown below).…

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Q: For the reaction, N2(g) + 2 O2(g) ➞ 2 NO2(g) , the enthalpy change is 33.9 kJ/mole of NO2 formed.…

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Q: Nitric oxide (NO) can be formed from nitrogen, hydrogen and oxygen in two steps. In the first step,…

A: Let us consider; N2(g)+3H2(g)→2NH3(g)                             ;   ∆H1=-92kJ…

Q: For which one of the following is the enthalpy of the reaction the same as the enthalpy of…

A: Enthalpy of fornation :-  The enthalpy change involved in the formation of 1 mole of a compound from…

Q: C 2H 5OH() + 30 2( g)→ 2CO 2( g) + 3H 20( ) AH=-1.37 x 10 3 kJ I. The reaction is endothermic II.…

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Q: .  Consider the combustion reaction of ethane gas, C2H6(g):   C2H6(g) + 7/2O2(g)  à  2CO2(g) +…

A: The given reaction is  C2H6(g) + 7/2O2(g)  ---->  2CO2(g) + 3H2O(g)  ,   ∆H = -1430 kJ Converting…

Q: When 0.828 g of sodium metal is added to an excess of hydrochloric acid, 8610 J of heat are…

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Q: 4. A 5.00 gram sample of an unknown metal was placed in a beaker of boiling water (99.58 °C). After…

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Q: A scientist measures the standard enthalpy change for the following reaction to be -19.4 kJ :…

A: Given reaction  Ca(OH)2(aq) + 2 HCl(aq)     ------- >     CaCl2(s) + 2 H2O(l)  Δ H rxn = -19.4 KJ…

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Q: Indicate the sign of the enthalpy change, in the following processes carried out under atmospheric…

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

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Q: What is the change in enthalpy in kilojoules when 2.30 mol of Mg is completely reacted according to…

A: Given: 2 Mg(s) + O₂(g) → 2 MgO(s)      ∆H = -1204 kJ Observing above reaction it is clear that…

Q: The propane fuel (C3H8) used in gas barbeques burns accordingto a thermochemical equation:C3H8(g) +…

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Q: What is the change in enthalpy in kilojoules when 2.30 mol of Mg is completely reacted according to…

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Q: Sand is converted to pure silicon in a three step process. The third step is   SiCl4(g) + 2Mg(s) →…

A: Given:SiCl4(g)  + 2Mg(s) → 2MgCl(s)  + Si(s)        ΔH  = –625.6 kJ

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Q: Using values from Appendix C in your textbook, calculate the standard enthalpy change when gaseous…

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Q: Part A Hess's law states that "the heat released or absorbed in a chemical process is the same…

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Q: 3,000 J of heat is added to a system and 2,500 J of work is done by the system. What is the change…

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Q: Consider the following thermochemical equation: 2 Mg(s) + O2(g) --> 2 MgO(s) ∆H° = –1204 kJ What…

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Q: A scientist measures the standard enthalpy change for the following reaction to be -819.0 kJ :CH4(g)…

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Q: A 222.5 mg sample of sucrose (C12H2½O11) is combusted in a bomb calorimeter. The temperature of the…

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Q: When aluminum metal reacts with iron(III) oxide to form aluminum oxide and iron metal, 429.6 kJ of…

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Q: Calculate the molar enthalpy change of H2O(1) when liquid water is heated from 41.7°C to 76.2°C.

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Q: A calorimeter holds 55 g water at 21.0°C. A sample of hot iron is added to the water. The final…

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Q: Nitric acid can be formed in two steps from the atmospheric gases nitrogen and oxygen, plus hydrogen…

A: Given data is as follows: N2(g) + 3H2(g) → 2NH3(g)                              ∆H1=-92 kJ…

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Q: Sucrose (table sugar, C12H22O11) can be oxidized to co2 and h2o, and the enthalpy change for the…

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Q: 10) For which of the following substances is AH°f, the enthalpy of formation, equal to zero? a)…

A: Standard enthalpy of formation for an element will be zero if the element is present/formed in their…

Q: A scientist measures the standard enthalpy change for the following reaction to be -67.6 kJ :…

A: The expression for the calculation of change in enthalpy is shown below: where; ∆Hproducts =…

Q: Using the standard enthalpies of formation, what is the standard enthalpy of reaction? CO(g) + H,…

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Q: 1. A gas expands in volume and does P-V work on the surroundings equal to 325 J. At the same time,…

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Q: Which of the following has a standard enthalpy of formation of zero? A. la (9) B. Os (g) C. Brz (g)…

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Q: A scientist measures the standard enthalpy change for the following reaction to be -48.4 kJ:…

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Q: 2 NO(g) + O2(g) ––––> 2 NO2(g); ∆H° = –114.4 kJ Given the thermochemical equation above, how much…

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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.