QUESTION 11 Which of the following has a standard enthalpy of formation of zero? O3(g) 12(g) Ar(g) Br2(9)

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: Calculate the standard enthalpy of the reaction, AH° rn. for the thermite reaction: 2Al(s) +…

A: As we know that ΔHoreaction o ​   =∑Products nΔH0t  -∑Reactant nΔH0twhere , ∑Products nΔH0t=Enthalpy…

Q: Can the heat capacity of water be assumed when calculating the heat capacity of an unknown metal or…

A: The amount of heat absorbed (or released) by a fixed amount of a substance to change its temperature…

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: how to write the enthalpy cycle?

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

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: What is the internal energy of a system that has 45.2 J of work done to it and releases 74.6 J of…

A: Given, work done on system ,W = 45.2 J Heat released from system to sorroundings, q  = 74.6 J

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

A:

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: Based on standard enthalpies of formation, what is the standard enthalpy of reaction for the…

A: Given,The balanced reaction:1 N2 (g) + 4 H2O(l)  1 N2O4 (g) + 4 H2 (g)

Q: What is molar enthalpy?

A: Given, define molar enthalpy.

Q: The standard molar enthalpy of formation of NH3(g) is –45.9 kJ/mol. What is the enthalpy change if…

A: Given, The standard molar enthalpy of the formation of NH3(g) is given by= -45.9 kJ/mol The mass of…

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: 45. Which of the following concepts is represented by this symbol, ΔH°rxn? Group of answer choices…

A: Enthalpy of reaction, enthalpy of combustion etc. concept are used in thermochemistry chapter.  When…

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

A:

Q: The enthalpy change for heating a one mole sample of an ideal, monoatomic gas at 25°C is 3.75…

A: Enthalpy is the heat content of a system. The enthalpy change of a reaction is roughly equivalent to…

Q: The amount of heat (q) gained or lost by a substance (with mass m) as its temperature changes (A7)…

A:

Q: Is the total enthalpy (H) of the reactants more than or less than the total enthalpy of the products…

A:

Q: Determine the change in work of a system if it undergoes -979 J of energy change and 877 J of heat…

A:

Q: Which of the following is true about Hess's law? The enthalpy change is dependent of the pathway by…

A: According to Hess Law, if a chemical reaction can be expressed as the sum of two or more chemical…

Q: Which of the following makes sense: When volume of a system is under constant pressure, which of…

A: The enthalpy change is defined as the internal energy change plus product of constant pressure and…

Q: In the laboratory a student finds that it takes 34.3 Joules to increase the temperature of 13.7…

A:

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: An automobile engine provides 519 Joules of work to push the pistons.In this process the internal…

A: The objective of the question is to calculate the amount of heat (q) that must be carried away by…

Q: An intermediate step in the industrial production of nitric acid involves the reaction of ammonia…

A: Before moving on with the problem, balancing the unbalanced equation is very important- The balance…

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: How do you calculate ΔH°rxn from tabulated standard enthalpies of formation?

A: It is a thermodynamic property and is generally used when we need to calculate heat or energy in a…

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: What is the standard enthalpy of formation of carbon dioxide?

A: The change in enthalpy when one mole of compound is created from its constituents from their most…

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.