Chemical energy is released or absorbed from reactions in various forms. The most easilymeasurable form of energy comes in the form of heat, or enthalpy. The enthalpy of a reaction canbe calculated from the standard heats of formation of the substances involved in the reaction:• Part AA,H° =E,A; H° (products) – ET,A,H° (reactants)Calculate the standard enthalpy change for the reaction2A +B 20+ 2DHere, , represents the stoichiometric coefficients of the products, n, represents thestoichiometric coeffi cients of the reactants.where the heats of formation are given in the following table:Ar H°(kJ mol)SubstanceThe standard entropy change for the reaction, A,S", is a measure of the change in how theenergy can be spread out during the course of the reaction. The standard Gibbs energy changefor the reaction can be estimated at any temperature usingA-265B-421A,G = A,H° -TA,S225assuming ArH° and A,S° do not change with temperature.D-483Express your answer in k.J mol> View Available Hint(s)A,H°- 435 k.J mol-SubmitPrevloun Answerev Correct• Part BFor the reaction given in Part A, how much heat is absorbed when 3.00 mol of A reacts?Express your answer numerically in kilojoules.> View Available Hint(s)Templates Symbole undo regio teset keyboard shortcuts HelpkJSubmit

Given: 2A+B↔2C+2D Substance ∆Hfo(kJ/mol) A -265 B -421 C 225 D -483

Answered: Calculate the standard enthalpy change…

Science

Chemistry

Calculate the standard enthalpy change for the reaction where the heats of formation are given in the following table

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

See similar textbooks

Related questions

Q: A scientist measures the standard enthalpy change for the following reaction to be -171.6 kJ :…

A: Given;

Q: Give the mathematical expression of enthalpy.

A: Enthalpy: it is the total amount of heat in a particular system. That is the amount energy absorbed…

Q: What is meant by the standard enthalpy of formation?

A: The difference in enthalpy during formation one mole of desired compound from its reactant elements…

Q: If a reaction receives heat from its environment, that reaction is.. and enthalpy change (AH) i.

A: an endothermic process is any process with an increase in enthalpy of the system in such a process a…

Q: The heat equation, as given in the introduction, can also be rearranged to calculate the mass or…

A: The specific heat required to raise the temperature of a substance is given as:

Q: Which of the following statements correctly defines Hess's Law? Hess's law states that if a reaction…

A: Hess's Law is a fundamental principle in the field of thermodynamics and chemistry, offering a…

Q: What's the purpose for the experiment Enthalpy Changes in Chemical Reaction?

A: Chemical bonds are formed because they happen to be favorable. Breaking them requires adding energy,…

Q: Based on this value and the standard enthalpies of formation for the other substances, the standard…

A: Standard enthalpy of formation is the change in enthalpy that accompanies the formation of one mole…

Q: how to write the enthalpy cycle?

A: The previous answer has shown all the necessary calculations and enthalpy changes. In case you want…

Q: If in a chemical reaction, thermal energy from the surroundings is converted to potential energy in…

A: In this, thermal energy of surrounding is converted to potential energy in chemical bonds. We can…

Q: A scientist measures the standard enthalpy change for the following reaction to be -601.8 k) : 20(g)…

A: Enthalpy of a formation This is refers to the change in enthalpy for the formation of one mole of a…

Q: Rearrange the equation to solve for m. m = When a substance with a specific heat of 0.180 J/g C is…

Q: [References] Use the References to access important values if needed for this question. A scientist…

A: ∆fH°(H2S,g) = -20.6 KJ/mole ∆fH°(SO2,g) = -296.8 KJ/mole ∆fH° (O2,g) = 0 KJ/mole

Q: during the combustion of 200 grams of a gaseous mixture of CO and SO2, 1213.75 kJ of heat are…

A: mass of total mixture of CO and SO2 is 200 grams.Total heat released during combustion of the…

Q: What is molar enthalpy?

A: Given, define molar enthalpy.

Q: Many portable gas heater and grills use propane as a fuel. Using standard enthalpies of formation,…

A: Thermodynamic is the branch of chemistry that mainly deals with the heat transfer between system and…

Q: Part A Chemical energy is released or absorbed from reactions in various forms. The most easily…

Q: A scientist measures the standard enthalpy change for the following reaction to be – 783.8 kJ:…

Q: How are enthalpy of a reaction and temperature change related?

A: Relation of enthalpy of reaction and temperature change:

Q: What is enthalpy change for a reaction and how does this differ from the experimental heat flow…

A: Definition~ Enthalpy is the measurement of energy in a thermodynamic system. The quantity of…

Q: What is the enthalpy change if 40.0 g of is allowed to react with an excess of carbon?

A: Enthalpy change : It the energy change i.e. when the number of moles of products will be formed from…

Q: I can determine mathematically how much energy will be produced or absorbed for a given chemical…

A: Energy produced or released ( or enthalpy change ) for a reaction can be determined using standard…

Q: The standard heat of formation for NO2 is 33.2kJmol. How much energy is required to form 810.0 g of…

A: Given : The standard heat of formation for NO2 is 33.2kJ/molWhich implies that 33.2 KJ of heat is…

Q: Calculating a Heat of Formation Using Hess’s Law As discussed in lecture, the simplest and most…

A: Given reactions: Reaction 1: Mg(s) + 2HCl(aq) --> MgCl2(aq) + H2(g) = Hreaction: -357.8 kJ/mol…

Q: Under what conditions does the enthalpy change equal the heat of a process

Q: 2NO(g) + 02(g)–2NO2(g) Based on this value and the standard enthalpies of formation for the other…

A: Given 2NO (g) + O2 (g) ---> 2 NO2 (g) ∆H rxn = -112.0 KJ ∆H°f (NO2) = ?

Q: What is specific heat? Write the specific heat of water. What is the standard enthalpy?

A: Specific heat and standard enthalpy are related to the concept of thermodynamics. Heat is also known…

Q: Using the standard enthalpies of formation, what is the standard enthalpy of reaction?…

A: Enthalpy change of a reaction is calculated by subtracting the sum of enthalpies of formation of…

Q: The enthalpy change of some reactions cannot be determined directly from calorimetric data and are…

A: Hess's law says that enthalpy change of any reaction is a fixed quantity and is independent of the…

Q: What is the value of the standard enthalpy of formation of an element in its stable form?

A: Standard enthalpy of formation: The change of enthalpy during the formation of 1 mole of substance…

Concept explainers

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.

Question

Chemical energy is released or absorbed from reactions in various forms. The most easily
measurable form of energy comes in the form of heat, or enthalpy. The enthalpy of a reaction can
be calculated from the standard heats of formation of the substances involved in the reaction:
• Part A
A,H° =E,A; H° (products) – ET,A,H° (reactants)
Calculate the standard enthalpy change for the reaction
2A +B 20+ 2D
Here, , represents the stoichiometric coefficients of the products, n, represents the
stoichiometric coeffi cients of the reactants.
where the heats of formation are given in the following table:
Ar H°
(kJ mol)
Substance
The standard entropy change for the reaction, A,S", is a measure of the change in how the
energy can be spread out during the course of the reaction. The standard Gibbs energy change
for the reaction can be estimated at any temperature using
A
-265
B
-421
A,G = A,H° -TA,S
225
assuming ArH° and A,S° do not change with temperature.
D
-483
Express your answer in k.J mol
> View Available Hint(s)
A,H°- 435 k.J mol-
Submit
Prevloun Answere
v Correct
• Part B
For the reaction given in Part A, how much heat is absorbed when 3.00 mol of A reacts?
Express your answer numerically in kilojoules.
> View Available Hint(s)
Templates Symbole undo regio teset keyboard shortcuts Help
kJ
Submit

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1

VIEW

Step 2

VIEW

Step 3

VIEW

Step by step

Solved in 3 steps

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.

Similar questions

When 1.42 g of iron reacts with 1.80 g of chlorine, 3.22 g of iron(II) chloride (FeCl2, molar mass = 126.75 g/mol) and 6.8 kJ of heat is produced. What is the enthalpy change for the reaction when 1 mole of iron(II) chloride is produced? round to sig figs
A student mixed 50.0 mL of water containing 0.010 moles of HCI (weighing 50.0 g) with 60.0 mL of water containing 0.012 moles of NaOH (weighing 60.0 g) in a coffee cup calorimeter. Both solutions were initially at 25.00°C, but after reaction upon mixing the temperature rose to 26.20°C. The specific heat of the solution is the same as that of water, 4.18 J/g °C, and the calorimeter has a heat capacity of 35 J/°C. The reaction is shown below. (a) How much heat is produced in the reaction? (b) How much heat is produced if one mole of water is formed in this chemical reaction? HCl(aq) + NaOH(aq) → NaCl(aq) + H20(l)
For an exothermic reaction, how is the measured temperature change affected if some of the heat produced transfers to the calorimeter? How will the determination of the specific heat of the metal be affected if the thermometer used to record the temperature of the water bath reads too low?
What is the standard enthalpy of formation for a compound? For a pure element in its standard state?
A scientist measures the standard enthalpy change for the following reaction to be -138.9 kJ: H,(2) + C,H,(g)C,H(g) kJ/mol. Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of C,H (g) is
Suppose that the molar enthalpy of a reaction is -69.06 kJ/mol and 1.134 moles are reacted. How many kilojoules of heat are released by the reaction? Report your answer to three decimal places (ignore significant figures).
A scientist measures the standard enthalpy change for the following reaction to be -104.0 kJ : Cog) + Cl2(g)–→COCl2(g) Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of CO(g) is kJ/mol.
A scientist measures the standard enthalpy change for this reaction to be -739.4 kJ/mol:2CO(g) + 2 NO(g)2CO2(g) + N2(g)Based on this value and the standard formation enthalpies for the other substances, the standard formation enthalpy of CO(g) is
A scientist measures the standard enthalpy change for the following reaction to be -234.6 k) : 2502(g) + 02(g)→2s03(g) Based on this value and the standard enthalpies of formation for the other substances, the standard enthalpy of formation of so3(g) is kJ/mol.
Enthalpy is the heat content of a substance at constant Temperature Volume Mass Pressure Other:
Given the thermochemical equations for reactions (1),(2) and (3) below, calculate the enthalpy change for reaction (4).
Calculate the enthalpy change for the reaction of magnesium and water using Hess’s Law.