What is the standard enthalpy of formation for a compound? For a pure element in its standard state?

Q: Is Enthalpy an extensive property? Explain?

A: An extensive property is one that depends on the amount of material present. Whereas an intensive…

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

A: Given;

Q: 5.60 How are the standard enthalpies of an element and of a compound determined?

A: The standard enthalpies of an element and of a compound have to be determined.

Q: If a student performs an endothermic reaction in a calorimeter, how does the calculated value of ∆H…

A: An endothermic reaction is the one that takes in energy, overall.

Q: Explain how to find the standard enthalpy of formation for one chemical in a chemical reaction if…

A: As per the Hess's law of constant heat summation, the enthalpy change for a process is the same…

Q: What does "Enthalpy change of a chemical reaction" mean?

A: Enthalpy change of a chemical reaction is defined as the amount of heat released or absorbed in the…

Q: Use standard enthalpies of formation to determine ΔHorxn for: 2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(l)…

A: Standard enthalpy of formation ΔH for C2H2, O2, CO2 and H2O are given.

Q: A scientist measures the standard enthalpy change for the following reaction to be 16.5 kJ :CO(g) +…

A:

Q: Using the standard enthalpies of formation, what is the standard enthalpy of reaction? CO(g) +…

A:

Q: True or False? Because a state function depends on the current equilibrium of the system, a set of…

A: True.

Q: A scientist measures the standard enthalpy change for the following reaction to be -132.2 kJ :…

A: Given chemical reaction is  4HCl(g) + O2(g) ---> 2H2O(g) + 2 Cl2(g) Standard Enthalpy change of…

Q: system that is doing work on the surroundings and also gaining heat from surroundings

A: Option 4. Is correct-> q= positive, w= positive We concentrate on the effect that a system (such…

Q: A scientist measures the standard enthalpy change for the following reaction to be -111.2 kJ :…

A:

Q: What is the change in enthalpy (ΔH) for a chemical reaction?How is ΔH different from ΔE?

A: In thermodynamics various terms are used. Some of these terms are work, heat, change in enthalpy,…

Q: A scientist measures the standard enthalpy change for the following reaction to be -773.2 k) :…

A:

Q: Why is there a discrepancy between an enthalpy of reaction obtained from calorimetry and one…

A: Calorimetry is an experiment which  is used in the determination of the heat of a reaction whereas…

Q: The standard heat of formation, AH, is defined as the enthalpy change for the formation of one mole…

A: Dear student , since you have posted multiple questions we will allow to solve only first question…

Q: Given the thermochemical equations below, calculate the standard enthalpy change for the following…

A: EXPLANATION: Standard enthalpy change is defined as the change in enthalpy of compound when there is…

Q: Using standard heats of formation, calculate the standard enthalpy change for the following…

A:

Q: (a) What is meant by the term standard conditions with referenceto enthalpy changes? (b) What is…

A: a) Standard conditions with respect to the enthalphy of changes would be the enthalphy that is…

Q: Use standard enthalpies of formation to determine ΔHºrxn  (kJ) for : 2NO2(g) -> N2O4 (g)

A: The enthalpy of the reaction, ΔH is calculated as,

Q: What is molar enthalpy?

A: Given, define molar enthalpy.

Q: Write the equation for the standard enthalpy of formation (ΔHf°) for solid magnesium nitrate.

A:

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

A: Relation of enthalpy of reaction and temperature change:

Q: A scientist measures the standard enthalpy change for the following reaction to be 209.8 kJ :…

A: Given: CH4(g) + H2O(g) --> 3H2(g) + CO(g) ∆H=209.8 kJ ∆H = ∑∆Hf (product) -∑∆Hf (Reactant)  209.8…

Q: How do I find kJ/mol with the enthalpy change given?

A: Given : enthalpy change  Required : KJ.mol-

Q: A scientist measures the standard enthalpy change for the following reaction to be -819.0 kJ :CH4(g)…

A: The given reaction is, Standard enthalpy of formation of CH4(g), O2(g) and H2O(g) is given below,

Q: A scientist measures the standard enthalpy change for the following reaction to be -780.8 kJ :…

A: The difference between the change in enthalpy of products and the reactants  is known as change in…

Q: A scientist measures the standard enthalpy change for the following reaction to be 215.5 kJ : CH4(g)…

A:

Q: KJ/mol. The heat of reaction for the combustion of a mole of Ti in this calorimeter is

A: The ∆Hcombustion is the amount of heat in the energy needed to burn per mole of a substance. Its…

Q: Is the change in enthalpy for a reaction an extensive property?

A: The enthalpy of a system is the sum of internal energies of the system and its  additional pressure…

Q: Using standard heats of formation, calculate the standard enthalpy change for the following…

A: Given;  Note: for standard enthalpy of formation, values are taken from the standard books.

Q: Using standard heats of formation, calculate the standard enthalpy change for the following…

A: Difference between enthalpy of formation of product to the enthalpy of formation of reactant is…

Q: Use standard enthalpies of formation to determine ΔHorxn for: 2NH3(g) + 3O2(g) + 2CH4(g) → 2HCN(g) +…

A: The standard enthalpies of formation are:△f H° (NH3) = - 46.19 kJ/mol△f H° (O2) = 0 kJ/mol△f H°…

Q: 12. The standard enthalpy of formation, ΔHfº, for which of the following is zero? a)  F2(g) c)…

A: The difference in the standard enthalpies of formation of products and reactants gives the value of…

Q: What is enthalpy, and what is ΔH for a reaction, and what does it mean if ΔH is positive or…

A: Enthalpy can be defined as the total amount of heat of the system which can be represented by a…

Q: Use standard enthalpies of formation to determine ΔHºrxn  (kJ) for : 2SO2 (g) + O2 (g) -> 2SO3…

A: The standard enthalpy change of a reaction is calculated by subtracting the enthalpy of formation of…

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…

Q: 10) For which of the following substances is AH°f, the enthalpy of formation, equal to zero? a)…

A: Standard enthalpy of formation for an element will be zero if the element is present/formed in their…

Q: What is the change in enthalpy (∆H) for a chemical reaction?How is ∆H different from ∆E?

A: In thermodynamics various terms are used. Some of these terms are work, heat, change in enthalpy,…

Q: determine the enthalpy change for the complete combustion of one mole of ethane with oxygen gas to…

A:

Q: A scientist measures the standard enthalpy change for the following reaction to be 209.4 kJ : CHĄ(g)…

A: Given chemical equation: CH4g+H2Og→3H2g+COg

Q: A scientist measures the standard enthalpy change for the following reaction to be 151.6 kJ :…

A:

Q: A scientist measures the standard enthalpy change for the following reaction to be -104.0 kJ : CO(g)…

A: The given chemical reaction is as follows: CO(g) + Cl2(g) → COCl2(g)            ∆rH°=-104 kJ The…

Q: Use standard enthalpies of formation to calculate ΔHrxn∘ for the following reaction:…

A: The reaction given is N2O4 (g) + 4 H2 (g) → N2 (g) + 4 H2O (g) The standard enthalpies of formation…

Q: A scientist measures the standard enthalpy change for the following reaction to be -234.6 k) :…

A: Answer: To solve this question we have to use the relation between enthalpies of formation of…

Q: A scientist measures the standard enthalpy change for the following reaction to be -876.3 kJ:…

A: Solution:- Balanced chemical reaction:- 2NH3(g) + 3N2O(g) → 4N2(g) + 3H2O(g) ∆Hf = -876.3 kJ…

Q: What does it mean when we say that enthalpy is a state function?

A:

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.