For the chemical reaction H2 (g) + F2 (g) → 2 HF (g) AH° = -79.2 kJ/mol. What is the enthalpy for the reaction 3 H2 (g) + 3 F2 (g) → 6 HF (g)

Q: AH; SO,(g) = -296.8 kJ/mol AH; SO, (g) = -395.7 kJ/mol

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Q: Thermometer When a solid dissolves in water, heat may be evolved or absorbed. The heat of…

A: The heat released in the reaction is equal to the sum of the heat absorbed by the solution and the…

Q: The reaction between sodium metal and chlorine gas produces 822 kJ of heat energy for every chlorine…

A: Given data, Mass of Na=1.416gEnergy produced for the given reaction=822kJ

Q: A scientist measures the standard enthalpy change for the following reaction to be -1142.2 kJ:…

A: Standard enthalpy of formation of H2S (g) = -20.1 kJ/molStandard enthalpy of formation of O2 (g) = 0…

Q: solid, or to measure the energy of a solution phase reaction. A student heats 65.30 grams of gold to…

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

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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: A 25.0 mL sample of benzene at 19.9 0 C was cooled to its melting point, 5.5 0 C, and then frozen.…

A: Since the heat involved in the process of cooling and freezing a solution is given by  Cooling =>…

Q: An engineering student wants to study the heat transfer between a 50 g of heated block of iron (cFe…

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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.…

A: Exothermic reaction is the reaction in which energy is released in the formation of products while…

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

A: Given data,Mass of Na=0.828gHeat=8610JMolar mass of Na=23g/mol

Q: A scientist measures the standard enthalpy change for the following reaction to be -132.2 kJ :…

A: Given chemical reaction is  4HCl(g) + O2(g) ---> 2H2O(g) + 2 Cl2(g) Standard Enthalpy change of…

Q: A 37.15 gram sample of copper (specific heat, 0.385 J/g•°C) with an initial temperature of 95.8°C is…

A: We know that, according to the law of conservation of heat energy, energy gained or loss by the…

Q: 1) The three combustion reactions are: C(s, gr) + O>(g) --> CO,(g) AH =-393.50 kJ H,(g) + ½0,(g)…

A: Solution:    The change in enthalpy of formation is the enthalpy change when the formation of one…

Q: When an alloy containing 20 g aluminum (c = 0.900 J g⁻¹ K) and 29 g copper (c = 0.385 J g⁻¹ K⁻¹) at…

A: Given that;   Mass of aluminum MAl  = 20g Heat capacity cAl  = 0.900 J/g°C  (unit correction)  Mass…

Q: Ammonia burns in the presence of a copper catalyst to form nitrogen gas. 4NH3 (g) + 302(g) → 2N2 (g)…

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Q: An engineering student wants to study the heat transfer between a 50 g of a heated block of iron…

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Q: In the following experiment, a coffee-cup calorimeter containing 100. mL of H2O is used. The initial…

A: Given: Volume of calorimeter = 100 mL Initial temperature        = 23 oC Mass of CaCl2…

Q: The combustion of neopentane is described by the reaction: C 5 H 12(s) +O 2(g) CO 2(g) +H 2 O (l)…

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

A: The total change in enthalpy for the solution is the sum of all changes regardless of the distinct…

Q: Ammonia burns in the presence of a copper catalyst to form nitrogen gas. 4NH3 (g) +302(g) 2N2 (g) +…

A: Given chemical Reaction :- 4NH3 + 3O2 ---> 2N2 + 6H2O  ∆H = -1267 kJ  Molar mass of NH3 = 17.031…

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

A: The given reaction is, Standard enthalpy of formation of CH4(g), O2(g) and H2O(g) is given below,

Q: КОН, heat ETOH H,0(1), heat CH2 NH,(aq), heat HCN, heat ETOH KOH(aq), heat

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Q: If a 50.0g sample of Cu is heated to 180.00C and is placed in 100.0 ml of water in a calorimeter at…

A: Given :  Mass of Cu sample = 50.00 gm  Initial temperature of Cu = 180 °C  Volume of water = 100 ml…

Q: 9. What would be the final temperature if 8.94 x 103 joules of heat were added to 454 grams of…

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Q: Ammonia burns in the presence of a copper catalyst to form nitrogen gas. 4 NH3(g) + 3 O2(g) → 2…

A: The terms specifying heat gain/loss during products' generation in any thermochemical reaction is…

Q: 12. The standard enthalpy of formation, ΔHfº, for which of the following is zero? a)  F2(g) c)…

A: The difference in the standard enthalpies of formation of products and reactants gives the value of…

Q: 1. The thermochemical equation showing the formation of ammonia, NH, from its elements is Nalg) +…

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Q: Octane (112.224 g/mol) undergoes combustion to form carbon dioxide gas and water vapor: 2 C8H18 (l)…

A: Given, Octane (112.224 g/mol) undergoes combustion to form carbon dioxide gas and water vapor: 2…

Q: Measurements show that the energy of a mixture of gaseous reactants decreases by 249. kJ during a…

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Q: With this information and the specific heat of water, 4.184 J/(g·°C), calculate the specific heat,…

A: Given,  The specific heat of gold metal,  when 38.600 g Au metal at 65.17 °C added to 60.00 g of…

Q: Measurements show that the energy of a mixture of gaseous reactants decreases by 206. kJ during a…

A: The work done on the gas mixture is =-145. kJ The change in the energy of the gas mixture is = 206.…

Q: q) + HCI (aq) → H20 (1) + NacI (aq) 6.13 kJ/mol ny kilojoules of heat are produced when 1000 mL of…

A: The question is based on the concept of chemical thermodynamics. we have to calculate heat produced…

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…

Q: When 10.00 g of phosphorus is burned in O2( g) to form P4O10(s), enough heat is generated to raise…

A: Given; M = 10.0 g c = 4.2jgC ∆T = (38-18)oC

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: An engineering student wants to study the heat transfer between a 50 g of heated block of iron (cFe…

A: Assume that the water-horseshoe system is thermally isolated (insuIated) from the environment for…

Q: A new substance evolves (-1.64) kJ of heat when 17.15 g it cools from 106.2oC to 23.8oC. What is the…

A: Given :-  Heat (q) = -1.64 kJ  mass of substance = 17.15 g  Initial temperature = 106.2 °C  Final…

Q: Measurements show that the energy of a mixture of gaseous reactants increases by 169. kJ during a…

A: Answer :- 1. Change in enthalpy of gas mixture = ∆H = +337 kJ  2. Endothermic…

Q: When O.376 g of sodium metal is added to an excess of hydrochloric acid, 3910 J of heat are…

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Q: In a simple calorimeter, a piece of metal weighing 48.67 g was heated to 120.0 °C and then put it…

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Q: When one mole of ethylene gas, C2H4, reacts with fluorine gas, hydrogen fluoride and carbon…

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Q: An exothermic reaction liberates 7.58 kJ of heat in a coffee cup calorimeter containing 157 grams of…

A: A 157 grams solution has a specific heat of 4.184 J/g ◦C and temperature of the solution is…

Q: Use the References to access important values if needed for this question. Given the standard…

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

Q: 75: Octane (C8H18) is a component in gasoline that burns according to the equations: C3H12(0) +…

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Q: When 6.54 grams of Zn is placed in 500.0 mL of 1.00 M CuSO4(aq) in a coffee cup calorimeter, it…

A: Given data,Mass of Zn=6.54gMolarity of CuSO4=1.00MVolume of CuSO4=500mL=0.5LTemperature…

Q: The density of aluminum is 2.7 g/cm3 and its specific heat is 0.9 J/g.0. A piece of 9.7 cm3 aluminum…

A: Recall the following relation according to law of calorimetry          Q=mC×∆tHere Q is amount of…

Q: LP gas burns according to the exothermic reaction: C3H8(g)+5 O2(g)→3 CO2(g)+4 H2O(g)ΔH∘rxn=−2044 kJ…

A: Given:The balanced chemical equation:C3H8(g)+5 O2(g)→3 CO2(g)+4 H2O(g)ΔH∘rxn=−2044 kJVolume of water…

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

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Q: the combustion of magnesium metal releases thermal energy and light energy. This combustion reaction…

A: In certain reactions, when the reaction proceeds forward, the reaction expels heat. In the other…

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.