Consider the process of converting liquid water to steam: H20 (I) → H2O (g) What is true for this reaction? Select all that are true. It absorbs heat It has a -AH ΔΗ-0 It has a +AH It is endothermic It is neither exothermic nor endothermic It releases heat It is exothermic

Q: A 6.57 g sample of an unknown salt (MM = 116.82 g/mol) is dissolved in 150.00 g water in a coffee…

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Q: Expressing amounts of energy in different energy units is necessary to solve many chemistry…

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Q: The temperature of 82.0  g of water rose from 18.2  °C to 36.2  °C during a chemical reaction. If…

A: In this problem, we are given the mass of water (m), the initial and final temperatures (Ti and Tf),…

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: A 8.17 g sample of an unknown salt (MM = 116.82 g/mol) is dissolved in 150.00 g water in a coffee…

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Q: (SHOW CALCULATIONS) Use Hess's Law to calculate the enthalpy change for the reaction 1/8 Sg(s) +…

A: ΔHreaction = -297 kJ

Q: Using the Table of Thermodynamic Values, determine the change in enthalpy (kJ) for the following…

A: Hess's law  states that the amount of heat evolved or absorbed in a process is independent of the…

Q: Which of the following is true about an exothermic reaction? O The number of moles of products is…

A: ''In exothermic reaction, heat is released" therefore heat of reaction is negative

Q: When 3 moles of C is formed, what is the change in enthalpy? 3A + 6B + 5 kJ → 2C

A: Answer given below

Q: he combustion of butane produces heat according to the equation 2C4H10(g) + 13O2(g) → 8CO2(g) +…

A: give  for 8 mole of CO2 produced to release 5314 kJ/mol of heat  then you have to determine the…

Q: For items 1-3, refer to the equation: CH4(9) + 202(9) → 2H2O1) + CO2(9), with AH equal to -809.94…

A: 1) , 2) , 3)  Given :-  The given reaction is CH4(g) + 2O2(g) → 2H2O(l) + CO2(g) ΔH = -809.94 kJ/mol…

Q: Salve for AH for the reaction given the following data. Tell whether the reaction is endothermic or…

A: Exothermic reaction : A chemical reaction is said to be exothermic, if ΔH for the reaction comes out…

Q: A student performs a calorimetry experiment. The student combines 100. g of 0.40 M HC1(aq) with 100.…

A: Heat absorbed by the particular species = mass × heat capacity × temperature change

Q: Determine if the following reactions/processes are endothermic or exothermic. A+B → AB ΔΗ AH-75 kJ A…

A: Exothermic reactions release energy into their surroundings, while endothermic reactions absorb…

Q: fy the reaction endothermic or exothermic and give the cha on. (s) + 2 Fe (s) + 645 kJ → 2 Al (s) +…

A: As heat is added to reaction,  so it is endothermic reaction.

Q: The same student wanted to determine the heat of dissolution for potassium chlorate (KClO3, MW:…

A: The mass of KNO3 and water are given to be 10 g and 250 g respectively. The specific heat capacity…

Q: Ignition wires heat Thermometer A bomb calorimeter, or a constant volume calorimeter, is a Stirrer…

A: Molar heat of combustion of a substance is defined as the heat liberated during the complete…

Q: Consider the enthalpy diagram below, and assume that AH_f> 0 for both A and B. Consider a reaction…

A: The objective of the question is to understand the nature of the reaction where A converts to B,…

Q: In a coffee-cup calorimeter, 3.20 g of NH4NO3 is mixed with 86.00 g of water at an initial…

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Q: Consider the formation of molecular hydrogen H₂ from hydrogen atoms: H(g) + H(g) → H₂(g). Indicate…

A: Endothermic :  The reaction in which heat is absorbed by the reaction to break bonds or to go…

Q: Consider the following chemical reaction which produces nitric oxide from its constituent elements:…

A: According to the question, The reaction is given as, N2(g)+O2(g) → 2NO(g)      ∆Hr = 182.6 kJ/mol…

Q: A student performed the procedure described in the lab manual using 49.9 mL of 1.0 M HCI and 49.3 mL…

A: Molarity of HCl = 1.0 MVolume of HCl: 49.9 mLMolarity of NaOH = 1.0 MVolume of NaOH = 49.3 mLInitial…

Q: Based on the data below, what is the reaction enthalpy for the formation of anhydrous aluminum…

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Q: A chemist measures the enthalpy change (delta)H during the following reaction. Use this information…

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Q: The heat of combustion of glucose (C 6 H 12 0 6) is 2.82 x 10 kJ/mol. If a 1.25 g sample of glucose…

A: Option 6.21 kJ/oC is answer

Q: A 8.17 g sample of an unknown salt (MM = 116.82 g/mol) is dissolved in 150.00 g water in a coffee…

A:

Q: A quantity of 85.0 ml of 0.9M HCl is mixed with 85 ml of 0.9M of NaOH in a constant pressure…

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Q: Historically, naphthalene was used as the main ingredient in mothballs and is easily recognized by…

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Q: A 23.12-gram metal bar sample at 76.21 C is placed in a constant-pressure calorimeter containing…

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Q: Consider the reaction of sodium metal and water. 2Na(s) + 2H20(1) → 2NaOH(aq) + H2 (g) AH = -369 kJ…

A: 2Na(s)+2H2O(l) --->2NaOH(aq)+H2(g) ∆H = -369KJ On reversing the direction of reaction, sign of…

Q: The table lists the specific heat values of several substances. An unknown substance has a mass of…

A: Heat energy is given byq = m * C * ΔTwhereq = heat energym = mass of the substanceC = specific heat…

Q: Using the Table of Thermodynamic Values, determine the change in enthalpy (kJ) for the following…

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Q: which of the following processes is endothermic? propane burns in a gas gril water evaporates from…

A: The energy difference of the products and reactants is known as the energy change of a reaction. If…

Q: 15.0 mL of a strong base is added to 15.0 mL of a strong acid in a coffee cup calorimeter. The…

A: Given information: 15.0 mL of a strong base is added to 15.0 mL of a strong acid in a coffee cup…

Q: 15.0 mL of a strong base is added to 15.0 mL of a strong acid in a coffee cup calorimeter. The…

A: Given: The volume of the base = 15.0 mL The volume of the acid = 15.0 mL The concentration of the…

Q: You add some of the white crystals to a small test tube filled with water. The water in the test…

A: This can be calculated by specifi heat formula, CP = (dH/dT)P dH = Enthalpy change  dT = Temperature…

Q: A 6.57 g sample of an unknown salt (MM = 116.82 g/mol) is dissolved in 150.00 g water in a coffee…

A: “Since you have posted a question with multiple sub-parts, we will solve first three subparts for…

Q: A student mixes 67.0 mL of a 2.01 M sodium hydroxide solution with 22.4 mL of 6.45 M hydrochloric g…

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Q: Measurements show that the enthalpy of a mixture of gaseous reactants increases by 214. kJ during a…

A: GIven: The decrease in enthalpy of a reaction = 214 kJ The work done on the mixture = 62 kJ We have…

Q: Consider these reactions: Reaction 1: H₂(g) + Cl₂ (g) → 2HCl(g) Reaction 2: 20F2 (g) → O2(g) + 2 F2…

A: Recall the Reaction 1,                                    H2 g + Cl2 g → 2 HCl g…

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.