Zinc sulphide is converted into zinc oxide by heating in a furnace. ZnS(s) + 1.502(g) → ZnO(s) + SO2(g) What is the standard enthalpy change AH°, in kJ/mol, for the reaction? Substance AHP (KJ/mol) ZnS(s) -206 02(g) Zno(s) -350 SO2(g) -297 O 441 -882 +220.5 +882 -220.5

Q: When a 9.55-g sample of solid sodium hydroxide dissolves in 100.0 g of water in a coffee-cup…

A: Given : mass of NaOH = 9.55 g Mass of water = 100 g The heat absorbed by the reaction is given by  Q…

Q: In an experiment, 74.3g of copper was heated to 100.0 degrees C and then quickly dropped into 200.0…

A: Heat capacity is the amount of heat required to raise the temperature by one degree Celsius.…

Q: THERMODYNAMICS: A 1.61 g sample of acetic acid (HC2H302) was burned in excess oxygen in a bomb…

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Q: I'm not sure how to answer this question. The correct answer is in red.

A: Heat in kilojoules, specific heat capacity, temperature difference and the calculated mass are…

Q: Al (s) + 3 HCI (/) → AICI3 (aq) + H2 (g) When 2.683 g of Al is combined with enough hydrochloric…

A: The volume of the solution=200.0 mL  Mass of solution = 200.0 g (density =1 g/mL) Mass of Al= 2.683…

Q: 5.99 From the enthalpy of formation for CO, and the following information, calculate the standard…

A: Given data:  ∆H°=-283 kj/mol From standard table;  ∆Hf°(CO2(g) is given by, ∆Hf°=-393.5 kj/mol

Q: How much heat is required to raise the temperature of a 1.15 kg piece of copper metal from 25.0 °C…

A: Given :-  Mass of Copper metal = m = 1.15 kg = 1150 g  Initial temperature of Copper metal = Ti =…

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

A: enthalpy of dissolution, ∆Hdissolution = mass (m) ×specific heat capacity(s) ×temperature change…

Q: a) Combustion of 1 mole of butane gas, C4H10 involves 2874 kJ of heat. (i) Write a thermochemical…

A: i)   Thermochemical equation for the combustion of butane is,       C4H10 + 132O2 →∆ 4CO2 + 5H2O…

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

A: Enthalpy is a thermodynamic property which is an extensive additive property we are required to find…

Q: Using these reactions, fi nd the standard enthalpy change for the formation of 1 mol Pb0(s) from…

A: Using Hess law, we can calculate the standard enthalpy change.

Q: 7) When 0.180 mole of sodium nitrate, NaNO, was dissolved in water in a constant-pressure…

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Q: In the laboratory a student burns a 0.777-g sample of isophthalic acid (C,H,0) in a bomb calorimeter…

A: Given - Molar heat capacity of combustion = -3203 KJ/ mol Mass of isophthalic acid = 0.777g Initial…

Q: When a 3.25 g sample of solid sodium hyrdroxide dissolves in 80.0 g of water in a coffee cup…

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Q: The ΔH for the solution process when solid sodium hydroxide dissolves in water is 44.4 kJ/mol. When…

A: To solve this problem, first calculate the q for reaction by using formula q = n∆H. Using q value…

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

A: The first chemical equation is, N2g+3H2g→2NH3g       ∆H=-92 kJ......(1) The second chemical equation…

Q: Limestone, CaCO3, when subjected to a temperature of 900°C in a kiln, decomposes to calcium oxide…

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Q: When gasoline burns in an automobile engine, the heat released (325 J) causes the products CO2 and…

A: Given:   The heat released is 325 J. The work done by gas during expansion is 451 J.

Q: The process of dissolving ammonium nitrate,NH4NO3, in water is an endothermic process. a)what is…

A: Given Mass of ammonium nitrate = 4.40 g Mass of water = 100 g Heat absorbed by NH4NO3 = 3.30*102 J/g…

Q: The AH for the solution process when solid sodium hydroxide dissolves in water is 44.4 kJ/mol. When…

A: Given that : ∆Hsolution=44.4 kJ/molThe mass of NaOH=10.9 gThe mass of water=253 gInitial…

Q: A cylinder contains a gas under constant atmospheric pressure. When 0.434 kJ of heat is added to the…

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

A: Heat of dissolution :-          The enthalpy of solution, enthalpy of dissolution, heat of…

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

A: We have to calculate the net change in enthalpy for the formation of one mole of nitric acid.

Q: In the recovery of iron from iron ore, the reduction of the ore is actually accomplished by…

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Q: P4.10 We return to the 58-kg hiker of P4.9, who is climb- ing the 828-m-tall Burj Khalifa in Dubai.…

A: Given the mass of the body, m = 58 Kg * 1000 g1 Kg= 58000 g Given 1 energy bar = 1.25*103 kJ Energy…

Q: How much energy is required to change the temperature of 21.5 g Cu from 27.0 °C to 88.1 °C? The…

A: The weight of copper is 21.5 g. The given temperature values are 27.0 ˚C and 88.1 ˚C. The constant…

Q: Methanol, CH3OH(g), is a possible automobile fuel. The alcohol produces energy in a combustion…

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Q: A 50.0-g sample of a copper-zinc alloy is heated to 100.0oC. The hot metal is quickly added to 100.0…

A: Specific heat capacity is the amount of heat in Joules is required by the substance to raise its…

Q: Adding 4.28 g of NH, NO, (s) to 150 g of water in a coffee-cup calorimeter (with stirring to…

A: Given : Mass of water = 150 g Mass of NH4NO3 added = 4.28 g Initial temperature of solution = 18.4…

Q: 5) Ethyl alcohol is produced by the fermentation of glucose, C6H12O6. C6H1206(s)→2 C2H5OH(/) +2…

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Q: Combustion reactions involve reacting a substance with oxygen When compounds containing carbon and…

A: The reaction taking place is given as, => C2H2 (g) + 2 H2 (g) ------> C2H6 (g) Given : Heat of…

Q: Dimethyl ether, a useful organic solvent, is prepared in two steps. In the first step, carbon…

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Q: The thermite reaction in which aluminum metal reacts with iron(III) oxide to produce a spectacular…

A: The reaction is as follows: 2Al(s)+Fe2O3(s)--------->Al2O3(s)+2Fe(l).          ΔH =  -202.9 kcal.…

Q: A 222.5 mg sample of sucrose (C12H2O11) is combusted in a bomb calorimeter. The temperature of the…

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

A: To solve this problem we will use the given two thermochemical equations to get the enthalpy of…

Q: THERMODYNAMICS: A 1.4 g sample of acetic acid (HC2H302) was burned in excess oxygen in a bomb…

A: Given: Mass of acetic acid combusted = 1.40 g. Initial temperature = 22.59 oC Final temperature =…

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Q: In the recovery of iron from iron ore, the reduction of the ore is actually accomplished by…

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Q: Hydrogen gas, H2 , reacts explosively with gaseous chlorine, Cl2 , to form hydrogen chloride,…

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Q: The thermite reaction, in which powdered aluminum reacts with iron oxide, is highly exothermic.…

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Q: O THERMOCHEMISTRY Using Hess's Law to calculate net reaction enthalpy Lindsay Dimethyl ether, a…

A: Applying concept of Hess law.

Q: 9.53 Using these reactions, find the standard enthalpy change for the formation of 1 mol of PbO(s)…

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Q: In the recovery of iron from iron ore, the reduction of the ore is actually accomplished by…

A: Interpretation - In the given above all the reactions , here we have to calculate the ∆Ho for the…

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

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Q: 6.81 Compounds with carbon-carbon double bonds, such as ethylene, C,H4, add hydrogen in a reaction…

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Q: THERMODYNAMICS: A 1.96 g sample of acetic acid (HC;H3O2) was burned in excess oxygen in a bomb…

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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.