Which one of the equations below is an exothermic reaction? A) CO2 (g) → C (s) + O2 (g) AH° = 394 kJ/mol В) СаО (s) + Н20 () — Са(ОН)2 (аq) дн° %3

Q: of iron with oxygen may be surprised

A: a). For 1 mole of Fe2O3 formed ; ∆H will be -0.825 × 10³ kj / mol .

Q: Calcium hydroxide, which reacts with carbon dioxide to form calcium carbonate, was used by the…

A: Given, moles of CaCO3 formed = 3.8 mol

Q: Charcoal is primarily carbon. Determine the mass of CO, produced by burning enough carbon (in the…

A: Charcoal burns in the air and reacts with O2 to produce CO gas, which further burns with more O2 to…

Q: Calcium carbide, CaC2, is manufactured by the reaction of Cao with carbon at a high temperature.…

A: The question is based on the concept of chemical thermodynamics. We have  to identify the type of…

Q: Consider these reactions: Reaction 1: H2 (9) + Cl2 (g) → 2HC1(9) AH=-184.6 kJ %3D Reaction 2: 20F2…

A: ->If ∆H = +ve => reaction is endothermic reaction ->if ∆H = ,-ve => reaction is…

Q: How much heat will be released (AH) if 0.4501 mol of NH3 are mixed with 0.20 mol of O2 in the…

A:

Q: For the reaction H2(g) + 1 2O2(g) --> H2O(l)        ΔH = -286 kJ/mol    What is the enthalpy…

A: Balanced chemical equation: H2(g) + 1/2O2(g) --> H2O(l)        ΔH = -286 kJ/mol  Heat change per…

Q: How much heat, in kJ, is produced by the amount of octane needed to drive 619 kilometers in a car…

A: Combustion reaction: 2C8H18(l) + 25O2(g) → 16CO2(g) + 18 H2O(l)  Energy released on combustion of 2…

Q: רPi How much heat will be released (AH) if 0.2037 mol of NH3 are mixed with 0.20 mol of O2 in the…

A:

Q: Given the following reactions N2 (g) + O2 (g) → 2NO (g) 2NO(g) + O2(g) → 2N (g) the enthalpy of…

A:

Q: The standard enthalpy of formation of CO(g) is –111 kJ/mol [refer to this equation C(s) + 1/202g) →…

A: Interpretation -  To determine the enthalpy (∆Ho) for the reaction which is given as - 2C(s) + O2…

Q: Water gas, a mixture of carbon monoxide and hydrogen, is produced by treating carbon (in the form of…

A: Given :  Mass of carbon = 5.35 kg  Since , 1 kg = 1000 gm  => Mass of carbon = 5350 gm  Also,…

Q: Ethane, CH3CH3, is a component of natural gas. How many grams of ethane must burn to release 519kJ?…

A: The stoichrometry of the balanced chemical reaction states that two moles of ethane reacts with…

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

A: Thermochemical equation:

Q: Using the partial equations below, determine the enthalpy of formation of nitric oxide (NO). Hint:…

A:

Q: Sodium chloride is added in cooking to enhance the flavor of food. When 10.00 g of NaCl are…

A: Given: mass of NaCl = 10.00 g volume of water = 200.0 mL initial temperature of water = 25.0°C…

Q: Which of the reactions are exothermic? 2 Mg(s) + O,(g) → 2 MgO(s) + heat NH, (g) + HCI(g) → NH,CI(s)…

A: If heat is produced as one of product then the reaction is exothermic. If heat is used as reactant…

Q: Which of the following represents an exothermic chemical reaction? O CO2 (g) breaking into C (s,…

A: Exothermic reaction are those in which heat is released. For exothermic reaction ∆H is negative.

Q: Magnesium reacts with hydrochloric acid to produce hydrogen gas. ΔH°f for HCl(aq) = –167.16 kJ/mol…

A: A chemical reaction is categorized into two different types of reaction based on energy: endothermic…

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: How many moles

A: The balanced chemical reaction,  2Ga(ClO3)3 -----> 2GaCl3 + 9O2 □H = -130.4 kJ Form the balanced…

Q: $ A chemist measures the enthalpy change AH during the following reaction: 3 CH₂ Br(g) +…

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

Q: For the reaction below, 5.95 kJ of heat must be supplied to convert 13.43 g lead(II) oxide into pure…

A:

Q: If this reaction releases 651 kJ651 kJ of energy, how many grams of H2OH2O are formed? Show the…

A:

Q: Target Equation: (1)  Mg(s) + 1/2 O2 (g) → MgO(s) Reactions:  (2)  MgO (s) + 2 HCl (aq) → MgCl2…

A: Given: Reaction Mass (grams) of MgO(s)  Mass (grams) of Mg(s) Volume (mL) of HCl(aq)…

Q: 1. During an experiment, a student added 35 J of heat to a system. At the same time, the environment…

A: According to first law of thermodynamics , increase in internal energy of the system is given by ∆U=…

Q: Calculate AH for the reaction NH3 (g) + CH4 (g) → HCN (g) + 3 H2 (g), from the following data. N2…

A:

Q: Given the standard enthalpy changes for the following two reactions: ΔΗ° = 66.4 kJ (1) N₂(g) +202(g)…

A: -> When equation is multiplied with any constant then enthalpy also multiplied with that…

Q: A lead ore, galena, consisting mainly of lead(II) sulfide, is the principal source of lead. To…

A: We are given two reactions with their change in enthalpy values as follows, PbS(s)+ 32O2(g) → PbO(s)…

Q: 112. The thermochemical equation for the combustion of methanol is CH3OH (g) + 3/2 O2(g) → CO2(g)…

A: The chemical reaction of the combustion of methanol is CH3OH (g) + 3/2 O2(g) → CO2(g) + 2 H2O(l) ΔH…

Q: What mass of O2 in grams can be produced when 250.0 kJ of heat was supplied? (MM O2 = 32.00 g/mol)…

A:

Q: 1. What is the enthalpy change when 12.8 g Hz (g) reacts with excess (lig) to form HCl (g) H₂ (g) +…

A:

Q: How much heat (in kJ) will be released (AH) if 0.4501 mol of NH3 are mixed with 0.200 mol of O, in…

A: Applying concept of limiting reagent and heat released.

Q: Which of the following represents an endothermic reaction? H2(g) + F2(g) –→ 2 HF(g) AH= -542 kJ C(s)…

A: The question is based on the concept of chemical thermodynamics. we have to identify the endothermic…

Q: Charcoal is primarily carbon. What mass of CO₂ is produced if you burn enough carbon (in the form of…

A:

Q: A chemist measures the enthalpy change AH during the following reaction: 2 Al(s) + Fe,O3(s)→Al,O3(s)…

A: The given reaction is  The reactions for which change in enthalpy is to be calculated are these.…

Q: Hypothetical elements A2 and B2 react according to the following equation, forming the compound АВ.…

A: We will answer this question using ∆H value and calorimeter concepts.

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.