d) How many kilojoules of heat are absorbed when 40.5 g of MgO(s) is decomposed into Mg(s) and 02(g) at 4 & 5. Consider the following reaction: 2Mg (s) + O, (a) → 2MGO (s) AH = - 1204ko a) Is this reaction exothermic or endothermic? in kilojoules to three significant figures. three significant figures. constant pressure? Express your answer in kilojoules to three significant figures.

Q: A 6.61g sample of an unknown salt (MM=116.82g//mol) is dissolved in 150.00g water in a coffee cup…

A: Answer:Amount of heat released or absorbed during the dissolution of 1 mole of a compound is called…

Q: 3.| N2(g) + 3CI2(g) → 2NCI3(1) AH°rxn = +460 kJ The reaction is _thermic, heat flows bonds between…

A:

Q: The following thermochemical equation is for the reaction of N₂ (g) with H₂ (g) to form NH3(g).…

A:

Q: In a constant-pressure calorimeter, 60.0 mL of 0.310 M Ba(OH), was added to 60.0 mL of 0.620 M HCI.…

A:

Q: Consider the combustion of liquid C₅H₈ in oxygen gas to produce carbon dioxide gas and water vapor.…

A: Combustion is the reaction of a substance with oxygen. In the presence of oxygen, hydrocarbons…

Q: What is the net reaction?

A: This problem is based on Hess's law (Thermochemistry)

Q: When a 0.0157 g of a compound with a heat of combustion of -37.6 kJ/mole i burned in a calorimeter,…

A:

Q: The reaction for the combustion of propane is C₂H₂(g) +50₂(g) → 3 CO₂(g) + 4H₂O(1) heat: ΔΗ =…

A: Given combustion reaction; C3H8(g) + 5O2(g) ---> 3CO2(g) + 4H2O(l) delta(H) = -526.3 kcal/mole…

Q: How much heat is involved when 68.0 g of N2 are reacted in the reaction:
2N2(g) + 5O2(g) + 2H2O(l) →…

A: Given, the chemical reaction,2N2(g)+5O2(g)+2H2O(l)→4HNO3(aq)   ; ∆H =-256 kJamount of heat evolved…

Q: Complete the thermochemical equation,H + (aq) + OH - (aq) ---> H 2 O (l) Ho = ______ kJ/mol …

A: Thermochemical equation:

Q: If AH = -54.74 kJ for a chemical reaction, that reaction O is endothermic cannot occur is exothermic

A: In endothermic reaction heat is require while in exothermic reaction heat is given off.

Q: The experimental ?H is -213 kcal/mol. How much heat is released during the combustion of 45.3 grams…

A: We have to find the heat released

Q: The reaction for the combustion of propane is kcal (DOʻHT + (8) 0E – (3)OS + (3)*H°Ɔ mol AH = -526.3…

A: Given, C3H8 (g) + 5O2 (g) → 3CO2 (g) + 4H2O (l) ∆H = - 526.3 kcal/mol Note: negative sign (-)…

Q: Consider the reaction B,Ho(g) + 3 0;(g) - B,03(s) + 3 H,0(g) AH = -2035 kJ/mol Calculate the amount…

A: The given chemical reaction as follows --- B2H6 (g)  +  3 O2 (g)   →   B2O3 (s)   +   3 H2O (g)…

Q: If 51.44 kJ of heat evolved when 0.180 mol H2O(1) is formed from the combustion of H2(g) and O2(g),…

A: The number of moles of a substance is given as the mass of the substance upon its molar mass.

Q: For the reaction given, answer the following questions. S(s) + O2(g)  SO2(g)      ΔH = -296 kJ/mol…

A: As per the reaction: S + O2 ---> SO2 When 1 mole of S burns, then 296 KJ of heat is evolved. When…

Q: 8. How much heat is released when 266g of carbon dioxide are formed? 2C₂H +70, 4CO₂ + 6H₂O -> AH =…

A: 1.Combusion  of ethane is exothermic  reaction.  2 . when etane undergo combusion  give carbon…

Q: chemical reaction has a negative enthalpy of reaction (-ΔHrxn) What does this tell you about the…

A: We have to find which option is correct

Q: Reaction 3: N₂(g) + 20₂(g) Reaction 2 can be described as an [Select] [Select] reaction 2NO₂(g) ΔΗ =…

A:

Q: When 0.278 g of sodium metal is added to an excess of hydrochloric acid, 2890 J of heat are…

A:

Q: For the reaction H2(g) + 1/2 O2(g) --> H2O(g), DHo = -241.8 kJ. What quantity of heat, in kJ,…

A: Balanced Reaction H2(g) + 1/2 O2(g) --> H2O(g) Here heat is released during the reaction.

Q: Propane, C3H8, reacts with oxygen to produce carbon dioxide, water and heat. C3H8 + 5 O2 → 3 CO2 + 4…

A: Number of moles    = Given Mass/ Molecular mass

Q: Consider the reaction: C3Hg(g) +5 02(9) 3 CO(9) + 4 H20(g), where AH= -531 kcal/mol. How much heat…

A:

Q: 8. Consider the reaction: C,H1,O(s) + 60;(g) → 6CO:(g) + 6H;0(1) , the heat change q for this…

A: When the energy of the products is smaller than the reactants or the system releases heat in the…

Q: How much heat (in kilocalories) is evolved or absorbed in the reaction of 1.21 g of Na with H2O?…

A:

Q: 5) What quantity of heat (in kJ) will be absorbed by a 31.5 g piece of aluminum (specific heat =…

A: Answer 5.The specific heat of a substance is a measure of the amount of heat energy required to…

Q: 3. How many kilojoules are given off when 17.8 mol of CH4(g) react? CH4(g) + 202(g) → CO₂(g) +…

A: Methane reacts with oxygen to form carbon dioxide and water. The equation for the balanced chemical…

Q: If the heat of combustion for a specific compound is -1160.0 kJ/mol and its molar mass is 92.31…

A: Given information,

Q: Consider the following reaction: 2Cr2O3(s)    4Cr(s) + 3O2(g)  DH = 2279.4 kJ Calculate the…

A:

Q: Question 2 of 6 Submit In the following reaction, how many moles of CH3OH are required to produce…

A:

Q: 4. You wish to determine the amount of heat produced by the reaction of propane with oxygen. You are…

A: The thermochemical equations can be treated as algebraic equation which can be added,  subtracted,…

Q: 6. Use the following balanced equation to answer the questions. 2 Al(s) + 6 HCl(g) -> 3 H2(g) +2…

A: 2 Al(s) + 6 HCl(g) → 3 H₂(g) + 2 AlCl₃(aq)(a) First, we'll find the moles of Al reacting:Given mass…

Q: 3. The following acid and base solutions are placed in a calorimeter at constant pressure: 50.0 mL…

A: Volume of HCl = 50.0 mL = 0.050 L Molarity of HCl = 0.20 M Volume of NaOH = 50.0 mL = 0.050 L…

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.